1girl, alternate_costume, animal_ears, armpits, arms_behind_head, arms_up, black_buruma, black_sports_bra, brown_eyes, brown_hair, buruma, ear_covers, horse_ears, horse_girl, horse_tail, midriff, miyama_mizuki_(hoshihoshi1220), navel, nice_nature_(umamusume), open_mouth, own_hands_together, race_bib, short_hair, solo, sports_bikini, sports_bra, stomach, stretching, tail, thighs, umamusume