rejected due to quality issues. please provide any feedback or advice?

The second photo appears to have too much back shadow. 

But as already stated, it's difficult to critique thumbnails. 

Meanwhile, read these links from your Stock Contributor User Guide.

• 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

Post one picture as submitted and we will have a look at it. Your third picture seems to have a background problem.

If you are new to stock, you should consider these resources: https://helpx.adobe.com/stock/contributor/tutorials.html
Please read the contributor user manual for more information on Adobe stock contributions: https://helpx.adobe.com/stock/contributor/user-guide.html
See here for rejection reasons: https://helpx.adobe.com/stock/contributor/help/reasons-for-content-rejection.html
and especially quality and technical issues: https://helpx.adobe.com/stock/contributor/help/quality-and-technical-issues.html

If you are a generative AI contributor, please look into these instructions and fallow them by the letter: https://community.adobe.com/t5/stock-contributors-discussions/generative-ai-submission-guidelines/td-p/13549435

These appear to be thumbnails of the image and we won't be able to zoom in on the details as Adobe did when reviewing them.  For a detailed review, please post the same full sized photos you sent to be reviewed.