* Head: Quirrell has a large, turban-like head covering that he claims is to protect him from the sun. It's actually covering a second face, belonging to Lord Voldemort, stuck to the back of his head.
* Face: Quirrell has a pale, sweaty, nervous-looking face with large, watery eyes. He is constantly trembling and sweating due to Voldemort's presence.
* Body: Quirrell is described as thin and weak-looking. He is often hunched over and appears extremely nervous.
In summary, Quirrell's appearance is a mix of unassuming and eerie. His head covering hides a dark secret, and his trembling and sweat reveal his internal struggle and fear.