well...we put on what I call the "gas mask". I start the slope outward from just below the eyeline and run it back down to the chin. This Gasmask shape will get tweaked into the nose and mouth on the next page.

The other thing to note is that the head gets bisected vertically. this is for EAR placement. The ear is still located on the horizontal axises provided by the eye and the mouth.

Once you have this you're ready for some detailing.