Hmmmm. I can't decide about this image. I love the vintage look, and who doesn't love hot air balloons and clouds. But I don't think the composition of the balloons is particularly strong (such a large, empty gap in the center). Yet somehow, it is all still visually appealing. Very odd. And lovely.
Just to throw an idea out here. I think one of the defining features of a sphere is its ability to roll or at least be shaped like it could roll. Strangely I would call these balloon shaped rather than spherical. I know that would be a terrible way of describing the shape of a balloon but I hope you understand what I mean.
Probably not voting on this one but that's my 2 bits anyways