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Hi again, Chuck,
By morning's light I see that there was one more feature I wanted to mention -- the nose. The "problems" are the same as already discussed, namely, the strong, straight-on lighting and the sharp transitions between value shapes. The combined effect on the nose overall is to make it "plateau", appearing to have a very wide bridge and very steep sides.
Significantly, too, the treatment of the "bulb" of the nose is greatly affecting likeness. That area in the photo shows a very distinctive, almost pronounced roundness. In the painting, the kind of heart-shaped light on the tip of the nose is too large and comes down so far as to instead flatten and broaden the tip of the nose, and lengthen the nose overall. (I see this only in the painting, not in the photo.) You will see also in the photo that there's a little shadow across the top of that "bulb", subtle but nonetheless enough to indicate that the form plane is ever so slightly turning away from the light (that is, to indicate "roundness".)
Again, we're talking about the way form can be described by value. (It can be described by color temperature as well, but we're not ready to go there. Mastering a grayscale of values will serve you best right now.)
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