synzmayu, satono diamond (umamusume), umamusume, absurdres, highres, 1girl, ascot, black ascot, black thighhighs, brown eyes, brown hair, center frills, closed mouth, diamond (shape), ear ornament, frilled sleeves, frills, green jacket, green skirt, hands up, horse girl, jacket, long hair, looking at viewer, shirt, simple background, sitting, skirt, sleeves past fingers, sleeves past wrists, smile, solo, thighhighs, wariza, white background, white shirt, white streaks