Simple: It's not sharp. Stock photography is about craft and not art. You need to produce technically correct pictures (that's technical issues saying).
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
You have camera shake = not sharp. I guess you took this hand-held and with a slow shutter speed - 1/3 sec, you are going to get camera shake.