Skull demon sorcerer portrait, intricate gothic concept art by Terese Nielsen, Brom, Miho Hirano, hyperdetailed, dark black background, art nouveau style, deep vivid colors, fantastical and intricate details, triadic and complementary color scheme, trending on Artstation, Unreal Engine 5 matte painting, gothic fantasy masterpiece, ornate border, 16k UHD HDR10 resolution, splash screen quality, high-definition art, surreal elegance, detailed mutation effects, absurd surrealism, richly colored fantasy, atmospheric tone, dark yet vibrant mood, fantastical elements, otherworldly design, captivating portrait.