A woman in a white dress holding a sword in front of a red background

"Craft a vivid 4K wallpaper showcasing a character exuding darkness and madness. Picture a person with red hair and eyes wielding a sinister sword amid white skulls. The focus is on a lone girl with red eyes, an open mouth with a seductive, protruding tongue, long hair, and white accents. The character gazes directly at the viewer, her eyes glowing with madness. Enhance the atmosphere with sharp teeth, creating an eerie intensity. The composition aims to capture the essence of both darkness and insanity, providing a detailed and immersive 4K wallpaper experience."