rejections

Which Generative AI service are you using?

Viuda2: the monochrome tone may not pass (even that @daniellei4510 says that he has some monochrome assets, that got accepted, and there are some in the database). The most obvious issue is the left hand, that is weird.

V4 exposes artefact:

(artefacts are also present on the hand. I didn't look further, but I would probably detect countless spots in this image, where each of them makes the asset unfit for acceptance).

Toscana 3 is very soft.

Toscana 1 has this white border between woods and the sky:

Toscana 2 has this strange pattern (and other artefacts):

These are very close but @Jill_C is correct about the hands. As for the monotone images, I've had a number of them accepted, so that might not be the only issue with a couple of these. Finally (and hear me out), square images are the default dimensions for AI images. As such, they don't leave a lot of space for creatives to add something, crop as needed, etc. In fact, I've been taking a lot of my old square AI images and using generative fill to turn then into aspect ratios of 8:10, 16:9 and so forth, depending on the subject. 

The first image is very blurry and monochrome, which Adobe does not accept.

The hands are drawn incorrectly in the second image.

in the 3rd image, the hand on the armrest is messed up...

Zoom in on your images at 100% or greater and carefully inspect all areas. It is rare for an AI image to need no editing before uploading.