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.