That's a nice crop indeed. The problem with this setup is you can't get the waves/water layer to end exactly on the beach/planet. So the foam ridges won't work well with the sand.
I therefore made another version including the beach with the water layer. But since that (sphere) has shadows turned off, stones on it won't have shadows either. I didn't yet attempt to add them to that setup. Maybe just put them on a small plane locally and have them protrude through the sphere... possibilities abound, but I'm working on something else again
But in time I will get back to this, and also check if the surf works the same on other beaches, which is to be expected.
