Here are a couple of suggestions for you:
You wrote that the shadow that doesn't make sense was in the photo. That's probably not enough of a reason to put it in the painting, if it's not contributing to your design in some way.
Regarding the hand: you may want to have someone else pose as a "hand model" and shoot some better reference photos. Be sure the pose, lighting and camera viewpoint are the same if you do.
Good luck!
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