1girl, animal_ears, bare_shoulders, bikini, blue_sky, blush, breasts, brown_hair, cleavage, collarbone, daiwa_scarlet_(trifle_vacation)_(umamusume), daiwa_scarlet_(umamusume), day, hair_intakes, horse_ears, horse_girl, horse_tail, izumi_akane, large_breasts, long_hair, looking_at_viewer, navel, ocean, official_alternate_costume, open_mouth, outdoors, red_bikini, red_eyes, self_cosplay, sky, smile, solo, splashing, swimsuit, tail, thighs, twintails, umamusume, very_long_hair, water