problemi di qualità

Stock won’t teach you to curate your own photos. It’s assumed you already know how to do that. 

Examine images at 100% to 300% magnification in Photoshop or Lightroom.

Use onboard tools to help you check for proper light exposure, sharp focus, ample color saturation, neutral white balance and lack of unwanted artifacts— sensor spots, noise, halos or chromatic aberrations.

https://helpx.adobe.com/stock/contributor/help/quality-and-technical-issues.html

Additionally, all Stock assets should have good composition, commercial value and aesthetic appeal to create customer interest.

Read your Contributor User Guide for more details about what’s required.

https://helpx.adobe.com/stock/contributor/help/photography-illustrations.html

https://helpx.adobe.com/stock/contributor/help/editing-dos-and-dont.html

Hope that helps.

If you post the rejected image here, members of the community will provide their opinions as to the possible reasons for rejection.