Can you help why did my picture rejected ?

Hello,

The photo is way, way overexposed. This is because you shot directly into the sky.

Read about the composition of a photo, as yours doesn't have any!

The basics of photography composition | Adobe

and exposure

What is an exposure in photography? | Adobe

In addition to @RALPH_L 's assessment, with which I agree, this type of snapshot has no commercial appeal. How did you imagine a customer using such an image?

Adobe Stock customers expect the highest visual and technical quality for use in commercial projects.

• https://helpx.adobe.com/stock/contributor/help/reasons-for-content-rejection.html
• https://helpx.adobe.com/stock/contributor/help/quality-and-technical-issues.html
• https://helpx.adobe.com/stock/contributor/user-guide.html/stock/contributor/help/photography-illustrations.ug.html
• https://helpx.adobe.com/stock/how-to/tips-stock-image-acceptance.html

This isn't social media.  It's a business.  If your image isn't as good or better than what Stock already has, don't submit.  

Better luck next time.

The fence and lamppost also break up the harmony of the composition. 

Remember Adobe Stock is a commercial service; you are in competition with the other suppliers. There are already 33 million images of trees https://stock.adobe.com/uk/search?k=tree&search_type=usertyped - what do you have to offer that is going to help your picture sell?