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I feel the facial expression, hand and arm positions, hair, and choice of clothing were intriguing; but I think that there is too much of a pronounced arch to the model's back. It shows at the sternum and the inclination of the hips.

This is very close to a great photo, but I notice the sense of the spine curve too strongly. If she was relaxed just a little more, I think you would have hit it. Very close.