7 - Nice colors. Good shapes. Criticism; slightly grainy (or could be resizing issues or gamma, not sure), especially at the top, which detracts overall, in my opinion. Difficult shot, and difficult to do, but even sharper/more defined, making the bubbles/shapes 'pop' more, and the colors a fraction too, make this even better in my opinion.
Clever idea and nicely done. I really like it when people use their imagination rather than just throwing something together or snaping the first thing that comes into their viewfinder. I feel that you should at least spend a couple of hours of effort on your entry for the Challenges. That's not to say that you can't get lucky and find the perfect shot right from the get go! LOL
What a wonderful shot. The fact that there are no "concrete" shapes adds to the appeal (to me.) I also enjoy the color at the bottom....I think it makes the photo more original and beautiful.