Your sculpt looks great! Very impressive work.
You said you removed the baseball helmet, so is the thing entirely made of Bondo then? If so, I am doubly impressed, but be careful with it. Bondo is not the strongest stuff. It'll shatter if it gets dropped. Are you planning on molding it? A fiberglass or urethane casting would be much more durable. I'd hate to see your nice work crumble from a simple mishap.