Hi Julie,
You have a beautiful drawing here. Great edge work, excellent likeness. You mentioned that you drew it with mainly pencil, just curious what other medium was used. Charcoal, perhaps?
If it's not too late, I have a minor suggestion. Try bringing out a little reflected light under her cheek/jawline, to further define some form. I know your photo ref doesn't show it much, but you can employ some license. If you haven't sprayed it yet, you can dab a kneaded eraser on it to pull it out.
Sincerely,
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