Portrait of Jack Skellington, fantasy, extremely detailed, digital painting, artstation, concept art, smooth, sharp focus, illustration, stunning lighting, night, art by artgerm and greg rutkowski and alphonse mucha and simon stalenhag, realistic character concept, dark atmosphere, gritty atmosphere, golden ratio, cinematic lighting, hyperdetailed, high resolution, insanely detailed and intricate, artstation, Marc Simonetti, Greg Rutkowski, 8k