Uh, PSZ, I don't mean to disrespect you but... that's horrible. There are too many wrinkles in the mesh.
Didn't you try working via the rule of curves? Take a close look through the wire-frame mode and you might see the mess made by vertexes. try to "curve" the lines running from the top of the head to below, then from the front of the head to the back. The curves, if followed from every view, should help the model flow better.