The issue with flatness in the form is mostly because of the frontal lighting in the original photograph. This can't be changed, so you'll be limited in how much roundness and depth you, or anyone else, would ever be able to convey from the reference you had.
You could minimize the flatness by removing some of the outlines I see, mostly around the hair, if you're inclined to make changes to this work. You mentioned it was done several years ago so maybe you'd rather go on to something new.
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