Rejected due to "Quality Issues" Please help

I agree with ​@Nancy OShea, but both images, especially the first, are lacking in contrast. And the reflect of the bridge in the water is does more to distract than add to the composition.

Short answer: little commercial value. 

To get accepted & make sales, your Stock images must be both visually & commercially appealing to lots of customers. 

Have you compared yours with available Stock content in the same keywords?

As a buyer, what would you use these for?

Read your Contributor User Guide for tips:

1. https://helpx.adobe.com/stock/contributor/submit-your-content/submit-photos/photo-submission-overview.html
2. https://helpx.adobe.com/stock/contributor/submit-your-content/submit-photos/technical-legal-requirements-photo-submission.html
3. https://helpx.adobe.com/stock/contributor/submit-your-content/submit-photos/photo-editing-best-practices.html
4. https://helpx.adobe.com/stock/contributor/submit-your-content/submit-photos/submit-photos.html

Hope that helps.

There is pronounced jaggedness (aliasing).
Also, the lens appears to be dirty, creating a hazy or foggy look.

I'm concerned about the composition of the second photo.