I particularly like the reflections of the dolphin in the blue spheres....that's a nice touch. The dolphin itself looks a bit angular in places, but I love the silvery metallic effect you've chosen..almost like the dolphin is made out of water. Very nice!
I really like this James. I love dolphins, and I'm a sucker for reflections. My only suggestion would be to smooth out the somewhat...jagged (can't think of another word lol) lines on the dolphin to make it more curvature.