Personally, I think she is very attractive and feminine. She's curvaceous, not skinny or fat. From voluptuous hips and thighs to a smaller waist, she's very naturally/evolutionarily desirable, as those traits tend to be a sign of fertility. My only gripe is that her breasts seem a bit small relative to the curves her lower body. Fuller, rounded breasts would look more balanced in my opinion. (It's a bit ironic that most of his other nudes have fuller breasts, yet Venus, the iconic representation of feminine beauty, doesn't.)