Just a note here: Most of the declines are because the image is too blurry. I wear glasses and if I find myself adjusting them or squinting to see if I am seeing the image correctly and it's still too blurry for my eyes, then it will be too blurry for a banner. There have been a few and still will be several yet to come, that do have some blurriness but often they are more 'artistic' for lack of a better term and do end up working out well. Since starting the banner management and now understanding what makes a good banner, I was better able to evaluate how they are going to look and I have deleted several of mine that just weren't quite right.
Other declines can also be if a dark space or blank area becomes too prominent in the banner once that ATP logo pushes it over.