One mistake I made when I first started taking photos was I didn’t think about the frame. I didn’t consider that the image I was taking would occupy a finite area defined by the photo itself. It seems kind of obvious in retrospect, but until I realized the implications of having my photo occupy the space created by the photo itself, I wasn’t taking photos that tried to work within that space.
In this case, the rail the balloons are tied to is down in one corner of the photo, while the balloons themselves tried to stretch to the other corner. The implied diagonal line helps create a more interesting photo.