Frank,
I will give you my husband's words of wisdom when I ask him to critique a drawing for me, "So far so good!"
Being the Photoshop junkie that I am, I always run a piece of transparency through my ink jet with the face of my subject the exact same size as it appears on my drawing. When you lay it directly over your work you can find little problems and correct them. So in this piece (assuming you are working from a reference photo) you would convert the drawing to gray scale and this would help you with the values as well.
Just a little technical info.
Rebecca
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