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These appear to be vector graphics. Please read the Stock Contributor User Guide for details on content requirements.
The three last don't look like you are the author of the assets. So, they will get refused for multiple reasons, including the signature of the second.
Now the poster looks like a vector graphics. Please give more details on how and in what format you submitted that asset.
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