It's looking really good, Richard, but there's one or two things I would do to it. Hesitate to mention them, but I still do. See what you do with it, it's a great entry anyway.
1. Reduce the huge stones at the coast; they actually quite large (5-10m?), which isn't too realistic. You should (or better said; I would) try stones of max 1meter and a narrower line. And perhaps a very few bigger ones.
2. Take the warp out of the foam fractal, and stretch the fractal a bit (1.5 or so) in the travelling direction.