1girl, animal_ears, ass, blue_hair, breasts, detached_sleeves, frilled_sleeves, frills, from_behind, hair_ornament, hat, horse_ears, horse_girl, horse_tail, jam_(jamjam777), large_breasts, long_hair, looking_at_viewer, looking_back, mejiro_ardan_(umamusume), one-piece_swimsuit, one_eye_closed, purple_eyes, smile, solo, swimsuit, tail, thighs, umamusume, very_long_hair