1girl, d, alternate_costume, animal_ears, bikini, black_bikini, breasts, cleavage, covered_navel, day, expansion_(pixiv76138286), eyewear_on_head, gold_ship_(run_revolt_launcher)_(umamusume), gold_ship_(umamusume), hand_on_own_hip, horse_ears, horse_girl, horse_tail, long_hair, looking_at_viewer, medium_breasts, official_alternate_costume, one-piece_swimsuit, open_mouth, outdoors, partially_submerged, purple_eyes, purple_hair, smile, solo, splashing, standing, sunglasses, swimsuit, tail, thighlet, tinted_eyewear, umamusume, water, wet