Overall I do like how striking and clean this one is, and in particular I think that you're getting a lot of mileage out of the lighting.  I will say that even though you hear waves the scene is a bit oddly static (you don't get the feeling of wind even though things are moving) and its a bit of a shame there's not more to show off the interesting lighting.  But I don't think either of those are easy problems.  I also might have noticed some distracting clipping?  Still, I wish I had a tropical drink on hand!  You had something to show off and hit it very well I'd say.