There is SO much I'd love to say but biggest thing is the inviting allure that the pose has plus the faded view of the model's face...hard to pinpoint emotion but that could be part of the mystery this photo has
I like how you brought her bottom into focus, letting her torso, arms and head softly drift into the background. This really enhances the purpose of the models pose - to pay attention to her ass, hiked up and vulnerable.
I like this because the lighting and pose want to be porn (it's not). An artistic piece, beautifully composed, that encourages the viewer to be drawn towards her bare buttocks and forget that there is an actual woman there... it prods us to objectify her sexuality.