Both of these pics show the short-focal length perspective in that which is closer to the lens is emphasized and appears larger. In both cases, her head/shoulders look disproportionately large for the rest of her body. It just looks totally wrong and distorted to me. The first is much worse, because the camera is higher above her head and the shooting angle is more severe.
These are the kind that I like better than the 'artistic nudes' that are just plain and nude. Although she's naked, things are covered up and it gives more to the picture. Well done with the rope placement. I like the cowgirl theme too.