The folowing is just my humble opinion .... and probably not worth any more than the paper it's printed on.
The pose in #2 looks way more forced than the pose in #1. In #1 you made art. #2 looks like you were trying to make art.
The lighting in #1, while a little harsh, adds a sense of drama to the image.
The piercings bring an updated element to an otherwise classic idea, especially since they are highlighted. Yes they do draw the eye to the breast but, the breasts are just one element in the image. The viewer is encouraged to explore the photo more as a result of this detail.
I love the hand position in #1. A viewer that didn't know for sure might be led to believe that it isn't your hand. The positioning brings a sense of mystery to the image. The shadow under the finger implies a slight amount of pressure or a caress if you will.
In short #1 is a very individual statement of a classic theme and, an absolutely stunning image. Where as #2 could just as easily end up in the "discard" pile (sorry).
Having viewed some of your other images posted on the forum (this is the first one that I've felt compelled to comment on) I feel that this is the one that you should strive to surpass.
........ Jim