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.