According to Jem's description in To Kill a Mockingbird, what does Boo look like?

Boo Radley, of course, has never been seen by the
children, and the only description of their mysterious neighbor is provided by Miss
Maudie, who only tells them that he "spoke as nicely as he knew how." But Jem has his
own ideas. He had seen what he suspected were Boo's footprints outside their house, so
he assumed that Boo was "about six-and-a-half feet tall." Boo drooled constantly, had
yellow, rotten teeth, and a "long jagged scar that ran across his face." His eyes
"popped," and he had bloody hands from all the raw squirrels and cats that he caught and
ate. Jem also believed Miss Stephanie Crawford, who also claimed to have seen
him and said his head looked like "a skull lookin' at her."