Drawing facial features ( just as drawing feet and hands) is not easy. It takes a lot of practice and even then it is still hard.

A good rule of thumb when drawing figures is if you can’t draw it then don’t draw it- suggest it.

What I mean by that is if you draw every little line and wrinkle if it is not photo perfect detail it may hurt your drawing rather than just using a few significant lines and gestures placed just so to give the viewer the feel of the feature instead. Like some of the impressionists and post-impressionists did. Specifically artists like Seurat.

Here is one for Seurat:

http://www.artic.edu/artexplorer/search.php?artistname=40810&tab=1&just=2

Your drawing might have more impact with suggestions. You don’t always need all the details. The viewer will still read it as the feature that the lines represent.

To get a good idea of where or how to place a line that suggests the feature- try squinting at it and that will help you see the shadows and outlines as opposed to the feature as a whole.