Thanks for the kind words, Doc and Jess. I can already see a couple of spots where I've messed up, but they should be fixable...
Smkie: Lol! That's how I usually start my basic line drawing once I'm past the general sketch for position stage. It seems easier to judge the distance between the various parts (ears, nose, etc.) once the eyes are in place.
Shading is all over the board for pencil, although I generally start in the vicinity of the eyes - With pastels (usually horses), once I have the shadows and highlights in place, I start my color layers at the nose and work up the face.