suggest to use merge model like AutismMix or Pony diffusion for anime
main tags:

tsuchimiya, competition swimsuit, 

example positive prompt:

score_9, 1girl, solo, looking at viewer, tsuchimiya, competition swimsuit, 

example negative:

score_4, score_5, score_6, source_pony, source_furry, bloom, white background, watermark, plus size, wide hips, thick thighs,