An accomplished rendering, Kris, of a difficult exercise in perspective.
Just a couple of notes. Double-check the width of the neck (it seems very wide here) and the structure of the ear (perhaps it's right, but it looks unusual).
The cast shadow on the neck is very dark, perhaps the result of information you're getting from the photograph. Photos are notorious for exaggerating darks and for eliminating interesting, form-defining variations in their value. And the edge of the shadow, running from the ear down the jawline to the chin, is uniformly sudden and hard, and exhibits little of the variation in direction and quality that would help define the form. Perhaps that thin strip of dark value running up from the back of the jaw, in front of the ear, should be raised in value enough to almost disappear.
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