IMO you have to much geometry, ive make misstakes like this when i just started modeling heads, i found out that the best way is just to restart, at least for me, i pretty much came up with my own way for starting out heads and stuff, i shape out the nose, mouth, chin, and the rest of the head (but not the ears) and then i just model the eyes and then the mouth, along with the nose at the same time.
Other then that its not to bad for the first model of a head.
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Q6600 intell qaud
4 gigs of ddr2 ram
8800GTS 512 video card @700mhz