Rejected for tech issues

First, it's black and white. Adobe stock moderators rarely accept black and white pictures. The buyer can transform the picture if he or she needs to, but to get the colour again back is impossible.

Second, you have a big white border around the picture. That's also something that is not allowed.

Third, you have a serious amount of clipping in the black area. A lot of shadow detail is lost.

Fourth, I think the picture is not very sharp.

Last, The people on the sitting in the café would need to provide a model release (different refusal).

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