Two other things, quickly . . .
The triangular base of the nose, in this lighting, should be pretty much one value. Don't look deeply into that dark value to try to find some lights to pull out, thinking that you need them for form. You'll just wind up overmodeling.
Squint at the photo, and the shadow cast by the nose is very close in value to the base of the nose. Squint at the drawing. Very different, much more contrast. Go over to The Dark Side. Get in there and state it with authority.
That shadow line in the ear runs all the way down across the lobe in the drawing. Compare that to how it looks in the photo.
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