Well, I don't know what I can say that the other commenters haven't already covered. First off, congrats on the top 20 finish! It's well deserved.
I love the flowy feel of the bubble shapes, the variety of sizes in the bubbles, the variety of tones in the background against the blue edges of the bubbles, and the textures. You've given the bubble just enough room around the edges without making it feel cramped or empty. I do have to agree with the one commenter though who said that they weren't fond of the border. I see where you were trying to pull in the color from the bubbles, but the blue line just puts it over the top for me. I would have gone with a simple black (or maybe b/w) border I think.
I love when such simple concepts turn out so beautifully, and this is a great example of that. Nicely done!
Really beautiful. Very sharp with nice color tones and variation of the background greens, making the overall composition quite interesting and adding extra depth beyond the centered bubbles. 10!
Very nice composition. I love the green complimented with the slight amounts of yellow and blue. The only thing that kept this from being a 10 was the blue and green matting. I don't feel that it adds anything to your image so I would choose a neutral frame. Still though, great photo!
Love the photo, hate the border!!! Just a plain black border or no border at all would be better. Giving it a 10, I usually don't subtract marks for borders.