Hello, since I'm a beginner, I don't understand why this photo was rejected. Please explain


You didn't tell us the rejection reason that Adobe gave you. But I suppose it's Technical Issues.
Details are smeared out, it's a typical issue of small sensor cameras. The chromatic aberration is strong:


The sculpture needs to get more light, from either a good flash or a nice reflector. The path in the lower left could be edited out or simply cropped out:

The sculpture in itself has an IP problem, the sign in the background as well.
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
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