Erm, for the face... the best way would be to use the standard method of drawing an elongated sphere shape first (the head), and adding a cross-hair (for the center line and the level of the eyes). The lines should be curved, and follow the 3D spherical presence of the face. This should help.
As a quick double-check, it is always good to flip the paper around and hold it up to the light to see a mirror image of the picture. (Flip Horizontal for Photoshop users). A mirror image will reveal a hundred things which you might not be aware of.
Attached is a quick Microsoft Paint sketch of drawing the guide lines (let's hope the file loads).
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