portrait of a man wearing a dark shirt, upper body 2d game avatar, default pose neutral expression, face-on, close-up, eye-contact, Donato Giancola, chiaroscuro lighting, vibrant expressive colours, shape language, Alphonse Mucha/Gustav Klimt style, alpha masked transparent flat grey background, 4k, volumetric lighting, French Nouveau, trending on artstation, octane render, hyperrealistic