what the problem is with the quality? Two identical files, but only with a different color are accep

The text on the image is the issue! 

As all others, I thinck that your account will get blocked for spamming. And that sooner than later.

Besides numerous duplicates throughout, one image on your first page appears a staggering five times. Clearly spamming and if they were all submitted at once, I can't imagine how they got accepted. 

It's difficult to inspect properly with the text overlay, but when I zoom in I see jagged lines (anti-aliasing I think?) along the beams in the ceiling, which makes it appear that this image is too low res.

I also clicked through the accepted images to look at your account. On your first page (I didn't look any further) you have a bunch of nearly identical images, a couple of them are actually duplicates - the dentist and little girl. If Adobe decides to re-inspect your account, you will surely be accused of spamming the database, which can be a reason for deactivation of your account.  You should remove the duplicates and very similar images.