1girl, animal_ears, ass, bad_twitter_id, bikini, blue_eyes, breasts, closed_mouth, hira_(hinakomochi), horse_ears, horse_girl, horse_tail, looking_at_viewer, narita_taishin_(umamusume), red_bikini, side-tie_bikini_bottom, simple_background, small_breasts, solo, swimsuit, tail, umamusume, white_background