If I had to guess, I'd say they were rejected for poor lighting & composition. Also there's not much wow factor.
Compare your work with what other Stock Contributors are doing to see what gets accepted.
Adobe Stock customers expect the highest visual and technical quality for use in their own projects.
Study links below:
1. Soft focus and white balance issue (too blue)
2. This one also seems to have a WB issue, and there are spots on the background, lower right corner.
3. Same as #2
4. Chromatic aberration and debris on the white disc
My approach when uploading a series of images is to upload just a few, see if they're accepted; if not, work on the issues before uploading more. It seems to take the sting out of rejection.
yes definetly see it now.
And thanks for the tip! Appreciate it