ultra-detailed illustration, cartoon style, thick outlines, uneven brush works, muted colors, 1boy, solo, male focus, square glasses, detailed red eyes, silver long hair, spiral demon horns, massive demon wings, a devil tail, a handsome demon in black long robe, flared wide sleeves, golden embroidery with cuffs and hems, belt pouch, slender, looking at viewer, adjusting eyewear, hand on hip, cowboy shot, dark background, midnight, gothic ruin, horror style, dark fantasy atmosphere, beautiful and aesthetic fantasy concept art