1girl, d, animal_ears, bare_shoulders, bikini, black_bow, bow, brown_eyes, brown_hair, collarbone, ear_bow, horse_ears, horse_girl, horse_tail, legs, long_hair, looking_at_viewer, mayano_top_gun_(umamusume), natsuki_(gedo), outdoors, partially_submerged, sandals, smile, solo, swimsuit, tail, two_side_up, umamusume, white_footwear, yellow_bikini