How to draw man's head...

1. Start with the basic outline of the head, which is a combination of the skull  and jaw.Note that over half the head in the skull area is represented by a globe.
2. The eyebrows fall a little more than halfway down the globe, and the eyes are a lot lower down on the face than you probably thought they were.The tops of the ears are even with the eyebrows. And the bottoms of the ears are even with the bottom of the nose, which also happens to fall at the same point as the bottom of the globe.From the bottom of the nose to the chin, divide the face into thirds by drawing two horizontal marks.The top mark is where the lips meet; the bottom one is the crest of the chin.Give him inward-sloping curves along the forehead. This is very important.They meet the eyebrows at the point where the eyebrows change Direction and turn in toward the bridge of the nose.
3. Details, details. Most beginners start off drawing the details because it's fun. 
Delay gratification until everything is locked in place, pals; it'll pay off. Then it's time to noodle with the image. Add those sleek contours that travel diagonally from the cheekbones to the chin.
4. Finally, tighten everything up and erase any guidelines.


P.S. The material is taken from the book "Christopher Hart - Drawing Cutting Edge Comics."