Hello here some settings that can help to get some good results
Recommended resolution: 512x768
lora weight: 1.0 - 1.1
Simpling method: DPM++ SDE Karras or Euler a
Steps: 30
Model: "Chilloutmix_NiPrunedFp32Fix" or "Chilloutmix"
CFG: 7
You can use some trigger words like: tzuyu, chewy
also you can use: "blonde hair", "brown hair" to get some variations