How about having the bubbles fill the right and left areas?
Also,i dislike the light effect you used on the top of everything: it tends to flat the image and makes it more linear. I'd take it off personally,instead a light effect coming out from the back of the text would be much more appealing to me.
I also don't see a reason to put the little text? It distracts alot and isn't easily readable,you may want to move it to the left maybe?