You have asked for a critique which includes both appreciation and criticism. This is a beautiful photograph of a beautiful woman. The composition is almost perfect thirds. The diagonal of the driftwood leads the eye to the lovely smile and leads the eye back again and again as the viewer takes in the rest of the scene. What small criticism I can offer is quite insignificant. I wish you had included all of the model's left elbow and a little more of her torso. Nevertheless it's superb.