Extraordinary design! The dress is inspired. The way the dress combines a very sleek edgey structure with frilly purple accents works well in this photo. The rooshing at the upper arms is just the right amount. The model pose has the right balance of drama to accentuate the dress and the woman.
While the background is best kept simple, I think it could use a little more texture. Perhaps a splash of color that matches the dress accents would work. At the bottom of the photo the legs get somewhat washed out because the background is so similar.