Realistic head from the side tutorial
Delineate Your Lips - how to draw a face by roslyn - How to draw lips correctly? The first thing to keep in mind is the shape of your lips: if they are thin or thick and if you have the M (or heart) pronounced or barely suggested.
Tutorial HOW TO DRAW A FACE by *MauroIllustrator on deviantART - I like when people say "How I draw faces" instead of "How to draw faces";
Art Ed Central loves: How to Draw a Nose (Front View) RapidFireArt Tutorials
Tutorial: How to Draw Lips mouth
How to draw a face Step by step tutorial Wikihow to(Drawing Step Shape)
This does a good job of teaching you how to do a basic head, you can easily customize many characters with this.