It is a beautiful drawing Snark, but it doesn't capture what you wanted to. It's immaterial as you've decided to move on rather than obsess about it but if you don't mind I'd like to stick in my tuppence worth because I think you are really looking for some input.
The girl's hand is stiff. In the photo she has a natural curve to her fingers.
Yes, to what was said about the neck and the expression in the eyes, but I also think that what has thrown the pic a little is the width between the eyes and the depth of shadow on the bridge of the nose.
Your art is always inspiring Snark and your worst pieces are things I could only aspire to in my wildest dreams. If I drew that baby, I'd be so proud it would be engraved on my headstone.