A request for help in understanding the rejection of photos for technical reasons

I even uploaded photos in virtually unchanged form.

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Digital photos typically require some post-process adjustment for exposure, color and detail.  It comes with the territory. 

Please read these links: 

• https://helpx.adobe.com/stock/contributor/help/reasons-for-content-rejection.html
• https://helpx.adobe.com/stock/contributor/help/quality-and-technical-issues.html
• https://helpx.adobe.com/stock/contributor/user-guide.html/stock/contributor/help/photography-illustrations.ug.html
• https://helpx.adobe.com/stock/how-to/tips-stock-image-acceptance.html

Don't post 7 pictures post one or two and if that does not give you answers for the rest, post a new one in a new   thread. As we are doing this for free, it's tiresome to look at each picture where the rejection reasons are probably similar. This is to train you to look at your refusals not to make your work. I agree with @Marianne-Deiters .