effort star, nice nature (umamusume), umamusume, commentary request, commission, pixiv commission, 1girl, alternate breast size (larger), animal ears, armpits, arms up, babydoll, bikini, blush, braid, breasts, brown hair, cleavage, closed mouth, ear covers, front-tie top, horse ears, horse girl, huge breasts, long hair, looking at viewer, mature female, navel, simple background, single ear cover, stomach, swimsuit, twin braids, underwear, white babydoll, white background, white bikini