What rejection reason with indicated?
Below is the resons they have said -
Thanks for giving us the chance to consider your image. Unfortunately, during our review we found that it contains one or more technical issues, so we can't accept it into our collection.
To learn more about the reasons why we decline certain images, including technical issues, please visit this page: https://www.adobe.com/go/stock-contributor-help
I don't see anything wrong with the image/s but there are many like this already excepted. I would maybe try something else or at least make these in to a set on one file.
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All in all, a moderately talented graphic designer can create those pictures in 5 minutes. I wouldn't even launch a search for them…
Forget your gradients, I assume the moderator has habitually selected the "technical issues" instead of "Commercial appeal". However, It may well be that he or she looked at the histogram and saw the overexposed areas present in the pictures. You should dim the whites a bit.
As for your Img_3 picture, I think that you need to crop the borders, and then you may try to resubmit. However, the right upper corner is also overexposed. Look into the histogram, and you see blown out whites.