A fantastical portrait of a skull demon sorcerer inspired by the styles of Terese Nielsen, Brom, and Miho Hirano, featuring intricately detailed gothic art influenced by art nouveau, set against a dark black background. The composition embraces triadic colors with vivid and complementary hues, crafted as a hyperdetailed, 16k UHD, HDR10 matte painting. The design showcases deep, rich colors and a fantastical ambiance, echoing the complexity of a gothic DeviantArt masterpiece. The image is framed by an ornate border, emphasizing the sorcerer's mutated form with an elongated neck, extra fingers, and a subtly deformed visage. The scene conveys a sense of mutation and otherworldliness, while avoiding low resolution, ensuring the image is free of out-of-frame elements, blurriness, or any jpeg artifacts, and excludes any watermark or text interruptions.