I like the second one more, gives a lot more depth. But the stuff on the sand gives the impression of shadows, I guess they are seaweed? You (I) can't really tell. What if you dump those (put them on the beach as floodline, maybe), and perhaps add some larger stones, just a few, clumped.
I like the foam, but I also think you should keep it more near the shore. It would work (foam scattered everywhere), if you had some larger rocks protruding from the water. I still think you need to flatten the wet area.