1girl, animal_ears, armpits, arms_up, ball, beachball, black_hair, breasts, cleavage, collarbone, hair_between_eyes, horse_ears, horse_girl, horse_tail, kitasan_black_(umamusume), medium_breasts, medium_hair, navel, ocean, one_eye_closed, open_mouth, red_eyes, sg_(esujii), sky, solo, swimsuit, tail, umamusume, water