There are many!
As a general remark: I would not submit such composed pictures because
a) they rarely pass, and it's hell a lot of work to get a clean and acceptable cutout. When doing this for a specific project, you can use tricks, that won't pass the quality control here, to make your work look good enough for the intended use.
b) the use for such composite are very limited. You would probably sell more pictures of the girl alone than with that complex background.
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
Ok.. thank you very much for your help. I understood now perfectly why this picture was rejected..