A detailed concept art depicting a classical Baroque oil painting of a devious demon, its eyes glinting with a manic intensity, set against a dramatic backdrop of swirling, tempestuous skies. The demon's flesh is a deep, bruised crimson, with jagged, obsidian-like horns curling menacingly from its forehead. Its wicked grin reveals rows of sharp, ivory teeth that gleam ominously. Elaborate, darkly ornate armor embellishes its form, etched with infernal symbols that flicker with an otherworldly glow. In one clawed hand, it holds an intricately carved, blackened staff, exhaling a faint, eerie mist. The scene is bathed in chiaroscuro lighting, casting deep shadows that mingle with the creature's own sinister aura, capturing the chilling essence of its psychopathic nature.