Image Rejection Query

As @Jill_C states, you need to submit the original asset here as submitted so that we can check the quality. Meanwhile, I suggest you do some reading.

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

It's impossible to inspect such a tiny thumbnail. You'll need to upload the full size original to obtain useful feedback.