1girl, animal_ears, arm_up, ass, bare_arms, bare_legs, barefoot, bikini, black_bikini, blue_eyes, blush, breasts, brown_hair, closed_mouth, day, glint, grass_wonder_(umamusume), halterneck, horizon, horse_ears, horse_girl, horse_tail, kneeling, legs, long_hair, looking_at_viewer, looking_back, outdoors, side-tie_bikini_bottom, small_breasts, smile, soles, solo, string_bikini, swimsuit, tail, umamusume, water, yamada_auto