I really don't know what exactly is wrong with this photo, but I think there are way too many angles on her upper body and it just looks weird. Weird enough to make me forget everything about her pretty backside. I don't think it is the models problem, if she changed her pose a little, it can be fixed.
I don't have any intelligent advice on this, but be careful with such things, because regardless of how beautiful the model is, it can ruin a shot completely.
The combination of beautiful models and superior photography skills make this gallery the hottest I've seen in DA. This is my favorite gallery so far and this is my favorite photo in your gallery. Thank you very much...It's been a pleasure!