I would like to know why this AI images were rejected.

You should post the original picture as submitted. You should also give us the refusal reason given by Adobe. And you should look at your pictures at 100 and 200% to detact artefacts. I suppose that your pictures experience some of them.

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