"Generate a close-up image of Mamonaku, the menacing shadow demon from Japan. Capture her unsettlingly wide grin, showcasing her pitch-black eyes with iridescent swirling patterns. Her ghostly pale skin is adorned with dark, intricate tattoos that seem to writhe. The expression should be alluring yet horrifying. The background should feature soft shadows and dim light, enhancing the chilling atmosphere that surrounds this haunting figure."