This is a very creative idea. The railing seems to be bit distracting. Next time put the glass on the railing. It looks like some over processing has occurred because the image looks a bit grainy in some areas. The DOF is pretty good.
I guess the reflection of sky and sea in the glass was meant to create the interest here. I just don't see it I'm afraid. Perhaps if you went in closer and made the galss a bigger part of the picture it would become more interesting.