Love the concept, pose, DoF, and setting. Here's what I'd change.
1. Bury a rock (or board) and have her stand on it on her toes. First, the sand cuts off her feet so she looks shorter and blockier. Second, by standing flat footed, her calves and legs look chunkier. It's a better pose to have her on her toes (which is tricky to do in sand unless you provide a solid base/foundation and then cover it lightly with sand.
2. Whether you did so or not, it looks like you lightened her hair a little and there's some spillover to the outcropping behind her (as if your lightening wand was too big). That may not have been the case but it looks like it.