Nice to have a new member. Hope you post a lot and will be able to purchase a full version in due time. It's terrific software.
This is a nice start, and I agree about the clouds. It would even look better if you just did some default cloud layers, and hit seed a few times for a nice coverage. This cloud is too dense, hard and white, I'm afraid.
Did you use any transparency in the water? A bit of a greenish density would be nice, and maybe just make the reflection a bit less, say 0.8-0.9. But the sea itself is very convincing, as is the added foam. Booby, shearwater or gannet (?) is post I presume?