Que opinan cual seria el problema tecnico de esta foto
The image is underexposed and you have noise:
Imposible no tener ruido tendría que tener una velocidad de obturacion muy baja cuando es el atardecer a contra luz
It's up to you to fix noise and other problems in post-production with Lightroom or Photoshop.
Adobe Stock won't do that for you.
Adobe Stock customers expect highest visual and technical quality. See links below.
If the picture is impossible to fix, it will be impossible to submit to stock. That does say nothing about the visual quality of your art. You may still be able to print the picture and expose it in your living room if you want.
Adobe stock assets are checked for certain criteria and if they are not met, the pictures won't pass. FYI: colour noise is easy to correct, however the underexposure will add to the problem when corrected. You need to adjust carefully the parameters.
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