In the admin panel, anytime a new image is submitted, we can see the old image right next to the new one. Some of the most common reasons that I personally reject image edits are:
A "RP" ESRB Rating on the image.
Blank barcodes (Just a white box where it should be.)
Wrong image location (Submitting a cartridge scan for a box image, etc.)
While I can't comment on your particular edits, since I haven't denied any in a while, I can say that it would have to be human error, or such a small change, that it got missed.