I've been following this thread for a while now because my own WIP is a head model too.

First of all great stuff, god knows how difficult it is to get the head right- but this is more than on its way.

I noticed you said you messed up on the eyes. Its something that has been causing me problems in my own work for a while. I just cudn't seem to get enough edge loops in around the eye.

Then I realised that you can make edge loops that don't just go around one eye, but both eyes. Kinda like goggles. It frees up a lot of your geometry. I saw it on a website once, but i can't remember which one :o

I'll have a look for it and post the address. In the meantime my WIP has a pic that might help you out.

WIP

Thanks for letting ur learning process also be part of mine, hope that helps in some way or another.