He has red hair and often changes his hairstyle every few decades. He has a black snake mark on the right side of his face next to his ear. He usually wears black and dark colours. He has yellow eyes with slit pupils like a snake that can change from just his irises being yellow to his entire sclera - this seems to be affected by his mood at the time. Crowley started wearing sunglasses to hide them from humans sometime after Noah’s Ark. He also has black wings but keeps them hidden mostly.