A detailed concept art of a malevolent demon rendered with realistic, intricate details, featuring chaotic brush strokes that capture the essence of late 20th-century concept art. The composition is dynamic and fluid, with high contrast and a dominant color scheme that emphasizes movement and drama. The demon's form is twisted and grotesque, with exaggerated features and a menacing presence, set against a swirling background that amplifies the sense of chaos and power. Subtle creative elements include elongated horns, jagged wings, and a subtle interplay of shadows and light that further enhances the artwork's intensity.