Interesting. Kind of reminds me of that one Finding Nemo scene. The only thing I would suggest is maybe outline the scuba diver's tank or make it a different color so you can see it. I had a hard time seeing the ocean in this, the bubbles helped but I still had to look at your author's note to make sure it was the ocean. I think a little more detail on the guy's tank and maybe flippers could help a lot.