I can see that this was posted back in '08, and I can only assume that you have grown as an artist since then, and therefor will take that into consideration on this critique. The chin is what is off the most, and you minimal shading. Contrast my friend!
Pic is too small but from what I can see:
Chin too pointed, shading too heavy all over face. If the pic on the right was the final pattern, why not truer to shape and shade? Looks old as is. Hope it can be fixed.