This going to sound crazy, but one aspect I love of this photo is the pattern in the mattress cover the way you are positioned right in the middle. It's like it totally draws the eyes in and up that wonderful figure.
Aside from your great looks and body, this is a great photo. I like the pose, lighting and the way all the lines and folds of the bedding all point to you. The lines and curves of your body add to the shot..nicely done!