Hi,

I suggest you use your faces better. Right now you have alot of faces that do not add anything to the model. It is just a waste. Try removing those and make a clean mesh, this also makes it alot easy to work with.

You have a couple places where polys are realy messed up, try to recreate those.

The shoulders look like they will deform real nasty,

And try to move the face up a bit,

Good luck.