First is underexposed as shown on the histogram, and also the blacks are missing, which creates this flat look.
In addition, it has a strange veil around the blossom.
Your second: A nice picture, but it's not in focus. You also have chromatic aberration
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
and the noise level is quite high.
Thank you !