I really like the bottom 70% of the photo. I wonder if you can either crop the top or fiddle around with it to bring it more into the mood of the rest of the shot. Even if you don't do this, great shot!
This is cool. On the question of "to crop or not too" I looked at the full image, looked at it at about the 70% suggested and didn't feel one was maybe better than the other.
I did also look at it cropped at the top of the last band of fog, making it a more panarama image. Check it out because it creates a very different image and the balloons and the amazing fog just hit you.
I kind of like how it already is... The ballons down in the corner are unexpected and
a pleasant surprize when your eye finally catches sight of them... This shot, IMHO.
is an example of when breaking the rules of composition is the exact right thing