Principal of the Thing is a dithered realistic photo of a lanky adult man with his right hand pointing upwards. His eyebrows are raised, his eyes are black voids and his mouth is open as if he is shouting. He wears a dark gray sweater-shirt with lighter stripes, pale blue jeans, a yellow bowtie and white socks (brownish-red due to dithering) without shoes. His legs are slightly glitched/erased, along with part of his left arm.

 (This is copy n pasted from the wiki)