for some reason i quite like this... not sure why but i do..
To me it represents some kind of surreal transition, top level is the night time area, transition down in to the day sky transitioning down in to the ocean, and mankind in the sea where we came from, I could go a lot further with what i see in here... but they would lock me up again.
again for me like your other post of the turtle in the sea its color balancing at the top of the image that looks a bit off...but again its only a personal preference thing for me... everyone else will see something different...
My Personal taste would have been to have the umbrella suspended ( hooked over ) over a half moon in the night sky ... the sky would be slightly less clutter with the star field and more dreamy which gives more of a balance effect on the ocean part at the bottom... in other words making the top section and the bottom section relate to each other in the overall composition..
i think what you put together is great image... but for me and me only this would be the start of the composition... i now have the main components of a really good surreal composition... so how can i take it further ? but not forgetting how can i make it all blend together.
I did some thing similar by just putting some random images together to see what i could come up with and how i could blend them together... i cam with an image of seal being lazy and having a nap on a sofa, but as seals come from the sea i made the room i put the seal in was also part of the beach ware the waves came in, the other images i used when putting it together was a tunnel/drain pipe through a wall, so i made this the area the seal had constant water supply from, but again it took quite a while doing color changes and balancing, saturation levels, curves adjustments and many more to get it all to blend .
Having said all that at the end of the day... if your happy with it yourself... then it really doesn't matter what anyone else thinks ...
AND I STILL LIKE IT.
maybe have some water over spill from the brolly, just a bit. oh and maybe some small splashes on the oceans top where the water would be hitting it... after all its raining under water, why not on top to show it?