Can anyone tell me why my photo was rejected?

The teeth are not drawn well and the shadows are too dark.

Photo or AI? AI is getting better, moderators are getting more stringent. That is good so. I guess the refusal reason was "Quality issues". So you should check the asset's quality.

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

The eyes are poorly drawn and the skin looks like plastic.

It's pretty easy to point out the issues. This AI (not a photo) needs a lot of cleaning up.