I am not giong to crit this to death but if you really want I could forward this to my lifedrawing tutor, she would tear it to shreads like there was no tomorrow.
I think it is a good attempt for your first head. Having said that it does kinda look like a grumpy alien baby at the moment so if you don't want to have 7 hours of your life wasted on an unfinished looking model do what arran said, maybe look at some anatomical drawings.

good luck with it