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
code
[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
code
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.