1girl, ahoge, animal_ears, bare_arms, bare_shoulders, bikini, black_bikini, black_hair, blush, breasts, cleavage, gradient_background, grey_background, groin, halterneck, horse_ears, horse_girl, horse_tail, katagirinanoka, kitasan_black_(umamusume), large_breasts, looking_at_viewer, navel, red_eyes, short_hair, smile, solo, stomach, swimsuit, tail, thighs, umamusume