Hello everyone can I know what is the problem in my photo?

Besides what has been said, I'll add noise and chromatic aberration.

I doubt, however, that a model release would be asked.

Aside from the more obvious technical issues and the need for model releases from all of the people, I wonder what narrative you might form from this photo?  With the people silhouetted, my attention is drawn to the sky, platform, and area beyond the platform.

I suspect a different composition would highlight why someone might want to stand on the platform.  Is there a great view?  Does this platform serve another purpose?

I can only add that there's a big green sensor spot in the middle of your photo.

And the camera stamp or watermark must go.  Adobe Stock won't accept images with camera data or watermarks on them.

Hello,

The blown out sun has turned it into a big white blob, so exposure issues here is a big problem! This has consequently made the foreground underexposed. 

Have a read of this from Adobe about how to create better photos:
https://helpx.adobe.com/stock/how-to/tips-stock-image-acceptance.html?set=stock--fundamentals--adobe-stock-contributor

The large blownout area in the sky is the most obvious issue, and the watermark is not permitted in stock.