This is looking really great - expecially for a first character!

I think what you have is ok, but as Carrot said - you should try using less polys. The one thing I do see is that there are a few 5+ sided polys, which is a no-no. Try and keep them all four sided. You can get away with three sided, but if you have alot in a tight area you could get into trouble when you converting to Sub-d's. You will have some nasty creases.

great work - I would love to see a shot of the head