the top of the head should resemble more of a skull then it currently does. you should pull some UV's outside the eye socket in a little to add definition.
the picture resembles an older man with a very long face but you disregarded the entire lower jaw.
you have the mouth way to pulled back at the edges. the mouth doesn't go that far back on the face. you also didn't give any definition to the cheek. you attempted to define the high parts of the neck a little but it should be much sharper.
personally i think you should have chosen a simpler base head image then the one you chose to do.
if i disregard the image you modeled it from the main problem is the mouth and forehead. along with its to much of an oval from the top view.
i suggest you at least skim over this tutorial as it shows the loops of the head very well.
[href=http://www.cgarena.com/freestuff/tutorials/max/headmodeling/index2.html]
http://www.cgarena.com/freestuff/tutorials/max/headmodeling/index2.html[/href]
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