After careful consideration, I've decided not to foam the entire head. It would be too bulky, especially once furred. I'm just going to add foam for a little definition, and to somewhat smooth out some major dents.
I'm also trying to decide how to do the eyes. I've narrowed it down to two...I'm either going to make rudimentary follow-me eyes from plastic canvas, or try the drinkable yogurt bottle trick that I read about. I'll have to see how big the bottles are first. (And what flavors they have. ;p )