This is really neat. I like your composition. The only problem I have with this is it feels a little dark around the rocks that don't have the highlights. Maybe a little bit brighter so that they would stand out just slightly more? Perhaps it's just my personal preference.
Regardless, I really like this. Good work. = )
I went remember snorkeling in the keys when I was really young...I know Margaritaville was nearby, but other than that I forget where it was. Such beautiful wildlife there. I'm jealous of this picture.