all photos rejected due to quality issues

From a compositional point of view:

You have part of the aerial going out of the picture.

Secondly, mobile phone towers, which are now placed everywhere, have destroyed the view of a nice old bell tower.

The result of the 21st-century living!! (This obviously is not a 'quality issue, but a comment on today's state of affairs.)

These images would have been quickly accepted a few months ago. Now they are sent to the ash heap with an arbitrary push of the reject button. When my reject rate went from 5% to 40% over the last few months, I stopped uploading. 

If there's a sky, dust on the sensor will be more noticeable.
It will be more noticeable if you shoot with a narrower aperture.
Enlarge the image to 100% to check.

IMG_13375-2.jpg is out of focus.

I suppose the shadows could be opened up a bit in this one. In addition to assets being rejected as being too similar to other examples in the database, It seems we're seeing a lot of "I've never had this many rejections before" posts. I think Adobe has been doing everything they can--and finding every excuse they can--to keep submissions to a bare minimum. But this is in contrast to anecdotal evidence that contributors submitting 100 or more assets at a time are getting many of them accepted, at least in comparison.