1girl, alternate costume, animal ears, blurry, blurry background, breasts, brown eyes, covering, covering breasts, horse ears, horse girl, horse tail, looking at viewer, medium breasts, medium hair, miyama mizuki (hoshihoshi1220), naked towel, navel, nice nature (umamusume), night, onsen, red eyes, sitting, solo, steam, tail, towel, umamusume