I've been trying to track her without result. A thousand tumblr iterations are worse than none. But from the quality and composition, I think the picture is professional.
*--Her face and hair are strongly suggestive of an aspiring model I knew about 15 years ago, but never had the honor of seeing naked. But from the tumblr excursion, I think this picture is much more recent, and the lady in question looks a bit older than this picture.