I think focus is a problem here. They are not sharp. (There are other issues as well.)
Have a read from Adobe about how to create better photos:
and a brief guide on image quality:
You should also follow the links and read for further information.
Inspect images at 100-300% magnification. That's when defects are more noticeable. If possible, correct imperfections in Photoshop or Lightroom. Otherwise discard them from your collection of suitable Stock photos.
The second image has focus problems, a blown out sky and the overall white balance is too green.
Adobe Stock customers expect the highest visual and technical quality for use in commercial projects. See links below.