nano-banana-prompts

SKILL.md

Nano Banana Image Prompt Generator

Generate high-quality prompts for Gemini 2.5 Flash Image using proven best practices from October 2025.

Core Principle

Describe scenes naturally, don't list keywords.

❌ woman, business suit, office, professional
✅ A professional businesswoman in navy suit stands confidently in modern glass-walled office overlooking city skyline. Warm afternoon light streams through windows.

Prompt Structure

Basic Template

A [SHOT TYPE] of [SUBJECT] [ACTION] in [ENVIRONMENT]. 
[LIGHTING] creates [MOOD]. [CAMERA/STYLE DETAILS]. [ASPECT RATIO].

Components

Subject & Action - Who/what and what they're doing

Setting - Where the scene takes place

Lighting - Natural/artificial light sources and quality

Mood - Emotional tone or atmosphere

Technical Details - Camera, lens, style specifics

Format - Aspect ratio or dimensions

Prompt Length

Short (10-20 words): Quick generation, minimal control

Medium (50-100 words): ⭐ RECOMMENDED - balanced control

Long (100-200 words): Maximum control for complex scenes

Photography Prompts

Template

Photorealistic [SHOT TYPE] of [SUBJECT], [ACTION], in [ENVIRONMENT]. 
Illuminated by [LIGHTING], creating [MOOD]. Captured with [CAMERA/LENS], 
emphasizing [DETAILS]. [ASPECT RATIO] format.

Camera Control

Lenses:

35mm, 50mm (standard)

85mm portrait (close-ups)

10-24mm wide (landscapes)

60-105mm macro (details)

Lighting:

Golden hour (warm, soft)

Blue hour (cool, atmospheric)

Three-point (studio)

Dramatic side (high contrast)

Rembrandt (classic portrait)

Settings:

Shallow DOF: f/1.4-2.8 (blurred background)

Deep focus: f/11-22 (everything sharp)

Motion blur for action

Example

Professional corporate headshot of mid-30s woman with shoulder-length brown hair 
in charcoal blazer. She's smiling warmly at camera against soft gray backdrop. 
Shot with 85mm f/2.0, studio three-point lighting creates gentle shadows defining 
facial features. Ultra-high resolution, LinkedIn-ready quality. 1:1 format.

Art & Illustration Prompts

Template

[STYLE] illustration of [SUBJECT] [ACTION/POSE]. [COMPOSITION] with 
[COLOR PALETTE]. [TECHNIQUE/MEDIUM]. Inspired by [REFERENCE], 
emphasizing [QUALITIES].

Common Styles

Watercolor painting

Digital art

Oil painting

Pencil sketch

Ink drawing

Anime/manga

Pixel art

Minimalist vector

Example

Watercolor illustration of young girl reading book under oak tree. Seated 
cross-legged in sun-dappled clearing with wildflowers. Soft, loose brushstrokes 
with pastel color palette of greens, yellows, pinks. Transparent washes create 
dreamy, ethereal quality. Inspired by children's book illustration, emphasizing 
wonder and tranquility. 4:5 portrait format.

Text Rendering

Best Practices:

Keep under 25 characters total

Maximum 2-3 phrases

Specify font style (bold, script, sans-serif)

Put exact text in quotes

Describe position explicitly

Example:

Movie poster with bold red text "SUMMER" at top and "Adventure Awaits" 
in white script font at bottom. Ocean sunset background. Cinematic style.

Multi-Turn Editing Workflow

Nano Banana excels at conversational editing. Make one change at a time.

Example sequence:

"Create professional headshot of woman in business attire"

"Change background to modern office"

"Make her wearing glasses"

"Add warmer lighting"

Product Photography

Template

High-resolution product photo of [PRODUCT] on [SURFACE]. [LIGHTING] 
to [PURPOSE]. Camera angle: [TYPE] to showcase [FEATURE]. Ultra-realistic, 
sharp focus on [DETAIL]. [ASPECT RATIO].

Example

High-resolution product photo of stainless steel smartwatch on white marble 
surface. Soft diffused studio lighting from 45-degree angle to minimize 
reflections and show screen clearly. Camera angle: slight overhead to showcase 
circular face and metal band texture. Ultra-realistic, sharp focus on watch 
face display. 1:1 format for e-commerce.

Landscape Photography

Template

[TYPE] landscape of [LOCATION] at [TIME]. [WEATHER/ATMOSPHERE]. 
[FOREGROUND ELEMENTS]. Shot with [LENS] from [VANTAGE POINT]. 
[COMPOSITION]. Professional landscape photography with [GRADING]. [MOOD].

Example

Dramatic landscape of mountain lake at golden hour. Wispy clouds catch 
warm orange light over snow-capped peaks. Weathered dock extends into 
mirror-still water as foreground. Shot with 16mm wide-angle from low 
lakeside vantage. Rule-of-thirds composition places horizon in upper third. 
Professional landscape photography with warm color grading. Serene yet majestic.

Abstract Art

Template

[MOVEMENT] abstract exploring [CONCEPT]. [COMPOSITION] with [COLORS/TEXTURES]. 
[MEDIUM] emphasizing [GOALS]. [CONTEXT].

Example

Bold geometric abstract exploring tension and harmony. Overlapping angular 
shapes with vibrant primary colors against deep black. Digital art emphasizing 
sharp edges and color interaction. Large-scale wall art format, 16:9.

Common Pitfalls

Avoid:

Keyword lists without context

Vague descriptions

Conflicting style instructions

Overly complex text rendering

Too many simultaneous changes in edits

Instead:

Use complete sentences

Be specific about details

Maintain style consistency

Keep text simple

Edit iteratively

Style References

When requesting specific artistic styles, reference:

Art movements (impressionism, art deco)

Artists (in style of Van Gogh's brushwork)

Media (watercolor, oil painting, digital art)

Eras (1950s photography, modern minimalist)

Aspect Ratios

1:1 - Square (social media, profile pics)

16:9 - Landscape (presentations, headers)

9:16 - Portrait (mobile, stories)

4:5 - Portrait (Instagram posts)

2:3 - Classic portrait

3:2 - Standard photo

Quick Prompt Checklist

✅ Subject clearly described
✅ Action or pose specified
✅ Environment/setting detailed
✅ Lighting source and quality
✅ Mood or atmosphere
✅ Style or technical specs
✅ Aspect ratio chosen
✅ Complete sentences, not keywords

Common Issues & Solutions

Prompt Quality Issues

Issue: Generic or vague output
Cause: Prompt too short or lacks specificity
Solution: Expand to 50-100 words. Add lighting details, mood, and specific technical specs (lens, style, etc.).

Example:

❌ Too vague: "A woman in an office"

✅ Specific: "Professional businesswoman in navy suit stands confidently in modern glass-walled office overlooking city skyline at golden hour. Warm afternoon light streams through floor-to-ceiling windows creating soft rim lighting. Shot with 50mm f/2.0, shallow depth of field blurs cityscape background. Confident yet approachable mood. 4:5 portrait format."

Issue: Conflicting style instructions
Cause: Mixing incompatible styles (e.g., "photorealistic watercolor")
Solution: Choose one primary style. For photography, use camera terminology. For art, use medium/technique terminology.

Issue: Text rendering failures
Cause: Too much text, complex fonts, or unclear positioning
Solution:

Limit to under 25 characters total

Use simple, clear fonts (bold, script, sans-serif)

Specify exact position ("at top", "centered", "bottom right")

Put text in quotes: "SUMMER"

Issue: Unwanted elements in image
Cause: Ambiguous phrasing or conflicting descriptors
Solution: Be explicit about what should NOT appear. Use precise, unambiguous language.

Generation Issues

Issue: Image doesn't match prompt
Cause: Prompt too complex or contradictory elements
Solution:

Simplify prompt to core concept

Use multi-turn editing workflow

Start basic, refine iteratively

Issue: Inconsistent results across generations
Cause: Vague descriptors allowing wide interpretation
Solution: Add specific details about colors, materials, lighting angles, camera settings, and composition rules (rule of thirds, golden ratio).

Issue: Poor composition
Cause: No compositional guidance in prompt
Solution: Explicitly mention composition rules:

"Rule of thirds composition"

"Centered subject with symmetrical framing"

"Leading lines draw eye to focal point"

"Foreground, mid-ground, background layers"

Multi-Turn Editing Issues

Issue: Too many changes at once causing confusion
Cause: Requesting multiple edits simultaneously
Solution: Make one change per turn. Wait for result before next edit.

Example sequence:

✅ "Change background to sunset"

✅ "Make the lighting warmer"

✅ "Add reflections on water"
vs.

❌ "Change background to sunset with warmer lighting and add reflections"

Issue: Losing context from earlier turns
Cause: Vague references without reinforcing key details
Solution: Briefly reinforce context: "In this mountain landscape, add a hiking trail in the foreground"

Prompt Validation

Before submitting a prompt, verify:

Content Completeness

 Subject clearly identified (who/what)

 Action or state described (what subject is doing)

 Environment/setting specified (where)

 Lighting described (source, quality, direction)

 Mood or atmosphere indicated (emotional tone)

 Style or medium specified (photography, watercolor, etc.)

 Aspect ratio chosen (1:1, 16:9, 4:5, etc.)

Technical Specifications

For Photography:

 Camera/lens mentioned (50mm, 85mm, wide-angle)

 Camera settings if relevant (f/2.8, shallow DOF)

 Lighting type (golden hour, studio three-point, dramatic side)

 Shot type (close-up, wide shot, overhead)

For Art/Illustration:

 Medium specified (watercolor, digital art, oil painting)

 Technique mentioned (loose brushstrokes, sharp vector)

 Color palette described (pastels, vibrant, monochrome)

 Style reference if applicable (children's book, manga, minimalist)

Quality Checks

 Uses complete sentences, not keyword lists

 Specific rather than vague ("charcoal blazer" vs. "suit")

 No conflicting style instructions

 Text under 25 characters if included

 Length appropriate: 50-100 words for balanced control

 No contradictory elements (photorealistic watercolor)

Text Rendering Validation

If prompt includes text:

 Total characters under 25

 Maximum 2-3 text phrases

 Text in quotes ("SUMMER")

 Font style specified (bold, script, sans-serif)

 Position explicitly stated (top, bottom, centered)

 Text color contrasts with background

Testing Your Prompts

Quick Test

Generate image and evaluate:

Subject accuracy: Is the main subject as described?

Composition: Does layout match prompt intent?

Lighting: Is lighting source and quality correct?

Style: Does aesthetic match requested style?

Technical specs: Are camera/art specs honored?

Mood: Does image convey intended atmosphere?

Refinement Workflow

If image doesn't match expectations:

Step 1: Identify the gap

What element is wrong/missing?

Is it subject, lighting, style, composition, or mood?

Step 2: Use multi-turn editing

Don't regenerate from scratch

Make targeted edit: "Make the lighting softer"

One change at a time

Step 3: Refine prompt for future use

If you need to regenerate, add more specificity to weak areas

Save successful prompts as templates

Comparison Test

For critical images, generate 2-3 variations with slightly different prompts:

Version A: Medium detail (50-75 words)
Version B: High detail (100-150 words)
Version C: Different style/lighting approach

Compare results to find optimal prompt verbosity and approach.

Example: Complete Validation

Prompt:

Photorealistic close-up portrait of elderly fisherman with weathered hands mending
fishing net at dawn. Seated on wooden dock with misty harbor in background. Soft
golden light from rising sun creates warm rim lighting on his profile. Shot with
85mm f/2.0 creating shallow depth of field, net and hands in sharp focus while
background gently blurs. Contemplative and peaceful mood. 4:5 portrait format.

Validation:

✅ Subject: elderly fisherman

✅ Action: mending fishing net

✅ Environment: wooden dock at harbor

✅ Lighting: golden hour, rim lighting

✅ Mood: contemplative, peaceful

✅ Technical: 85mm f/2.0, shallow DOF

✅ Aspect ratio: 4:5 portrait

✅ Complete sentences: yes

✅ Specific details: weathered hands, wooden dock, misty harbor

✅ Length: ~85 words (optimal range)

✅ Style consistency: photorealistic throughout

Expected result: High-quality, detailed image matching all specifications.

Troubleshooting Guide

Problem
Likely Cause
Fix

Blurry/low quality
Missing technical specs
Add camera, lens, "ultra-high resolution"

Wrong colors
Vague color description
Specify exact colors, hex codes if needed

Bad composition
No compositional guidance
Add "rule of thirds", "centered", etc.

Missing elements
Element mentioned too late
Put critical elements early in prompt

Generic look
Keyword listing
Rewrite as natural sentences

Text garbled
Too much text
Reduce to <25 chars, simplify font

Wrong style
Conflicting instructions
Choose one consistent style

Unexpected objects
Ambiguous phrasing
Be more explicit and specific