I love this. It's officially one of my favourites of yours. >w<
And what a coincidence! It reminds me of a music video that I'm in the process of doing (I even just switched over to see if there was anything new on dA while I was working on a beach scene with the music video, particularly a part that's a little similar to this).
Wonderful idea. :3 and good job getting the horizon line dead-on!! >w<