Base flux model is capable of generating heterochromia, but when using rare or unnatural eye colors it tends to generate them in a anime/cartoon style. With this LoRA you can generate heterochromia photo realistic and also improves photo realism on rare/unnatural eye colors without heterochromia.
How to use
Just use natural language prompts as with base Flux and incorporate heterochromia into it and specify what color of eyes you want (usualy the first eye you specify will be on the left of the image)
Trigger words heterochromia
Known issues
Doesn't work great at medium to long distances when subjects eyes are small
Enjoy :)