This shot has great timing and good composition, but unfortunately the actual shot doesn't appear to be planned out very well. Although the trees behind the bubbles provide a good backdrop, they are much too dark and only serve to prove that this shot is quite underexposed. The shot is exposed for the sky, which takes up only a small portion of this image, and creates way too much contrast.
In addition, there is a huge lens flare in the upper left and lower right regions of the image. Although lens flares can be effective, this one appears accidental, and detracts from the subject (the bubbles).
Great timing and composition of the shot. For the future, planning the shot out a bit more (i.e. considering the scene) will improve your score drastically. You clearly have the creativity to produce great shots.
Nice to have the background be very dark, to take some of the distraction away (the leaves make it busy so with a bright color I think it would just totally overwhelm the bubbles).