1girl, d, animal_ears, arm_support, beach, bikini, breasts, brown_hair, cleavage, daiwa_scarlet_(trifle_vacation)_(umamusume), daiwa_scarlet_(umamusume), front-tie_bikini_top, front-tie_top, groin, hair_intakes, horse_ears, horse_girl, horse_tail, large_breasts, long_hair, looking_at_viewer, navel, o-ring, o-ring_bottom, ocean, official_alternate_costume, outdoors, red_bikini, red_eyes, ropu_(ropu_10), self_cosplay, smile, solo, string_bikini, swimsuit, tail, tiara, twintails, umamusume, very_long_hair