This is going to be a hard critique to write, since I can't actually find a single element in this image that I would change. The composition is perfectly executed, with the elements on either side leading your eye right to the center of the image. The model's pose, as well as the arrangement of her clothing is impeccable, adding a sense of movement, but also with an air of serenity. The angle of the shot adds a sense of power to the model, as well.
Additionally, the stark contrast between the model's clothing and the surrounding elements lends itself perfectly to drawing out the details of the folds of cloth. The resulting feel to me is a perfect blend of sharply detailed and softly flowing, with the silk shawl and the pose of the model.