technical problems

Adobe also expect excellent composition. They mention horizons: yours is not level and will fail for that alone.

There is nose in the blues. In addition, the image is not very sharp, but it seems to me that the in-camera processing tried to compensate for that. The water has that strange painted texture that you get, when you de-noise and sharpen excessively. The colours are a bit oversaturated. The picture looks probably pleasant on your phone or tablet (as the processing is exactly working in that sense).

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