I send rejected photo of mushroom to reply me why you rejected this. Foivos Polenakis.
This is not Adobe, this is a user community. We are here for helping out to interpret the refusals, but we do not issue the refusals. You need to tell us Adobe's rejection reason. But I suppose, looking at your picture, the reason is "Technical issues".
I've identified the following problems:
Examine your pictures at 100% and 200%, and if you see artefacts, correct them before submission. If you can't correct them, don't submit.
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