This has something quite attractive going about it. I think it is the water motion contours. There is a good potential here.
I'd have a little bit more time with this in post. 1. Give it a little bit of the bottom space. Even just create it if you have to. It just needs some plain sand to give that stone some more space.
2. Sky. You 100% know it is darkened too far for not a very good reason. Sunset skies are not black. I appreciate it is a contrasty processing but it still is not black.
3. Push the highlights up further to create more contrast.