Cool tutorial! I remember one guy a long while back....I think the name started with an E (I REALLY wish search function was functional now). Anyway, he used flash too! Made some killer heads. Maybe Bendover remembers his name.

I like this tutorial because it guides you through the steps that are gonna be used in a lot of heads. Outlining > section the colors > rough shading > shading > fine tuning
It's loosely what I do

Love the head, but if you are making another one, take more care on the back and the top+ sides. There are many lovely details crytek put in, not just the pwnsome visor!