AI is rarely if ever perfect. Be on the lookout for broken lines, distortions, artifacts, poorly drawn objects and sudden shifts in perspectives.
Examine each image at 100-300% magnification and fix the imperfections if you can or discard the image and start over. Simple images are easier to work with. Complex images contain more mistakes. Also highly stylized images don't appeal to everyone. Some Reviewers may be reluctant to accept them.
There's a lot more to "quality" than just pixel count. Quality comprises focus, sharpness, accuracy in drawing details, exposure, composition, artifacts, etc.
All of these images appear blurry and soft with many drawing errors. I highlight just a couple below.
The finer details in most if not all of these images lack detail or are poorly rendered. Did you submit these as illustrations or photos? It should have been the former, but I doubt that would have made a difference.
Adobe Community Expert | If you can't fix it, hide it; if you can't hide it, delete it.