pretty... I see why sharks. The colors are magnificent, and the choice of background is perfect. But that graininess... What density were you rendering in? at least 4000? If so, then it must've been a big flame... Very nice.
Nice design and colouring. Definitely looks feathery to me. Just as well. Sharks probably need their skin but feathers you can find on the ground. Agree with za4em9 about the graininess, though. Something to look into, perhaps.