With the eyes being the windows to the soul, I'd look there first. The pupils seem a bit small and high, and the irises are a bit too light. The contrast between pupil and iris isn't that pronounced in the photo (nor in life, usually).
The image file seems highly compressed, and I think your gray and darker values are probably smoother than I'm seeing them through a notoriously bad AOL representation.
The drawing looks great, very accurate. I very much like the lost edge on the cheek's contour on the lighted side (our left). In the upper lip, the light just to our left of center is a little high. That surface is not that reflective. The light across the bottom lip, to our right of center, isn't quite that bright, either. Tip of the Day: Squint at your reference. That will simplify the essential value design, and you shouldn't mess with that too much by introducing subtle enhancements.
I don't know (or recall) if this is your son, but if so, keep doing these no less often than annually. I have sketches of my son that no one would deny are accurate -- we see them and we say, yep, that's him at that age -- but he's changed so much that nobody really remembers that he looked quite like "that," "then."
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