My image is refused? They said one or more technical issues, what it mean?

A nice picture, but it is oversaturated, overexposed and the colours are washed out. 

Due to the processing, you have artefacts introduced.

In addition, the picture is not very sharp.

I doubt that you can save the image for Adobe stock.

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

I am new...please help me