flux-best-practices

SKILL.md

FLUX Best Practices

Use this skill when generating prompts for any BFL FLUX model to ensure optimal image quality and accurate prompt interpretation.

When to Use

Creating prompts for FLUX.2 or FLUX.1 models

Text-to-image (T2I) generation

Image-to-image (I2I) editing with FLUX.2 models

Structured scene generation with JSON

Typography and text rendering

Multi-reference style transfer

Color-accurate brand generations

Quick Reference

Prompt Structure Formula
[Subject] + [Action/Pose] + [Style/Medium] + [Context/Setting] + [Lighting] + [Camera/Technical]

Model Selection

Use Case
Recommended Model
Notes

Fastest generation
FLUX.2 [klein]
4B or 9B, sub-second

Highest quality
FLUX.2 [max]
Best detail, grounding search

Production balanced
FLUX.2 [pro]
Quality + speed

Typography/text
FLUX.2 [flex]
Best text rendering

Local/development
FLUX.2 [dev]
Open weights

Image editing
FLUX.2 [pro/max]
Pass image URL directly to input_image

Inpainting
FLUX.1 Fill
Object removal/completion

Context editing
FLUX.1 Kontext
Older model, prefer FLUX.2

Critical Rules

NO negative prompts - FLUX does not support negative prompts; describe what you want

Be specific - Vague prompts produce mediocre results

Use natural language - Prose/narrative style works best

Specify lighting - Lighting has the biggest impact on quality

Quote text - Use "quoted text" for typography rendering

Hex colors - Use #RRGGBB format with color description

Related

For API integration (endpoints, polling, webhooks), see the bfl-api skill.

Rules Reference

Read individual rule files for detailed guidance:

rules/core-principles.md - Universal FLUX prompting principles

rules/flux2-models.md - FLUX.2 family: klein, max, pro, flex, dev

rules/flux1-models.md - FLUX.1 family: older generation of FLUX.2 models - pro, Kontext, Fill

rules/t2i-prompting.md - Text-to-image prompting patterns

rules/i2i-prompting.md - Image-to-image editing with FLUX.2

rules/json-structured-prompting.md - Complex scene composition

rules/hex-color-prompting.md - Precise color specification

rules/typography-text.md - Text rendering and typography

rules/multi-reference-editing.md - Multi-image references

rules/negative-prompt-alternatives.md - Positive alternatives

rules/model-selection-guide.md - Choosing the right model

Example Prompt

A weathered fisherman in his 70s with deep wrinkles and a salt-and-pepper beard,
wearing a navy cable-knit sweater, standing at the helm of his wooden boat.
Golden hour sunlight from the left creates dramatic rim lighting on his profile.
Shot on Hasselblad with 85mm lens at f/2.8, shallow depth of field with harbor
lights creating soft bokeh in the background. Kodak Portra 400 color science.