What does Billy look like? How does he feel about appearances?

Billy isn't very worried about his appearance, he'd rather spend his time in other ways.... like wandering around the river. 

Mama broke into the conversation, "I declare, what kind of a question is that? How far is it to Kentucky? I don't know what's gotten into that mind of yours lately. You go around like you were lost, and you're losing weight. You're as skinny as a rail, and look at that hair. Just last Sunday they had a haircutting over at Tom Rolland's place, but you couldn't go. You had to go prowling around the river and the woods."