Very sharp, great detail and color! However, there isn't a clear form in the picture, and also everything is the subject, so the eye really doesn't know where to settle... perhaps zooming out and getting just one of these, with the sand, will lead to a better picture form-wise.
I love this one. The detail in the sand is great, and the shells aren't so overpowering that they take away from the sand. The only thing I would change is the background color, but that's just me being picky. Great shot!!