About the poly thing, I think camels is right... if you check some blizzard models (and blizzard models are not always the best(in wc3 because wow models are good)) they have a lot more shape, even those that are for units like peasants. Trying out jigrael's tutorial might help as I said before. The face looks odd, as I already said and the eyes are weird-shaped. and also the helmet is somewhat funny. Apart from that is a good start.
Now, checking a bit the unwrap and the model, I can tell that the front of the face will be stretched, mainly in the middle part. I'd suggest making the unwrap of the face based on a cylinder instead of a plane, that way it's somewhat easier to skin and has less stretchments.
You could use a 4 sided cylinder instead of a box on the handle of the hammer.