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

• CFG: 7

You can use some trigger words like: dayunnie, dahyun,

also you can use: "blonde hair", "brown hair" to get some variations

High res is very recommended 1.0 - 1.5