Modelling a head...

What head references do you use to model heads?
I’ve been searching for a good blueprint to use for modelling a head but I haven’t found anything good… it should have a pictures of a head from the side and front…
Maybe I didn’t look hard enough…

I just use my general sense of human anatomy along with the KISS doctrine. It’s not that hard, you just have to learn to see what makes a human face human. Proportions are the key.

This might be useful: http://goldennumber.net/images/zahnface.jpg