This is a very nice piece, I really like the glimmering in the waves that you've done and not gone "overboard" with the dithering 

 This is awesome. Love it

 Congrats on third place, man.

That looks really cool! I like the waves, and the color but the hands look just a bit awkward to me.

Great job! I love it! The colors are fantastic :D

Great job, that hand in the waves is amazing.  Keep up the great work!

Love the texture and flow of the waves. A solid pale blue background like you have in the preview would add a lot, though, I think.

Awesome~ I like it

The transparency hurts it I think.

noice composition! Uncanny!

needs no background, it's awesome as it is. gotta love what you made of the opposing waves, and the sea textures are great.

 I loove the rendering of the scene.

Go with the flow, baby! Very nice.

 Cute and creative. The little boat is nice 'n simple.

beautiful flow. <3

I Love It The thing u did with the waves Is Realy  impressive =)

 Gorgeous. Everything about it is fantastic. Fav'd. =)

Completely agree with Jal.  Only thing that I would say that could do with fixing is the  saturated colors, but I think it doesn't really matter.

Really great design that needs no BG.