You might want to change "blunt bangs" in the prompt to (blunt bangs: 1.8) or (blunt bangs: 2.0) to stay more faithful to the character design.
If you want to have the character wear the Kitauji High School uniform, it might be best to find and apply a dedicated LoRA for it.
When using LoRA, it might be best to use LoRA 'DMD2' in conjunction with it, and generate the sample with Sampling Steps around 10 and CFG scale between 1.1 and 1.5 (other advanced settings can be left at their defaults). Adding the artist name to the prompt might also be effective, but you'll have to experiment with that yourself.
