Stained Glass (SD1.5, SDXL, Pony, Flux) - Flux API Documentation
by ModelsLabRecommended range is 0.6 - 1.2 strength .
Some prompts seem to work just fine without the trigger words, but I will recommend starting with them and around 1 strength.
stained-glass-sd1-5-sdxl-pony-flux-flux