If this is for ShutterStock, I think it would be very good to post these pictures on their forum itself. They have Photo Critiques section and their review are usually very good and ShutterStock oriented. I posted it in the forum a few times, until I got critiques that were good enough.

If this is for iStock, it is also good to get someone to post pictures in their forum.

In both cases, they are looking for a variety of subjects because they want you to prove that you can shoot diverse subjects and situations. I thin it would definitely help you to get some pictures with people in them.

Now, about some specific pictures:

1. The clouds behind are a bit burned.
3. Too tightly cropped. Might pass if supported by other subjects in the application.
5. The pole is not vertical. Try looking at every image involving the horizon or vertical lines and try to rotate the images to fix that.
9. Fix lighting in the corners (vignette).
10. Burned sky. Too tightly cropped.
11. Subject too centered.
15. Lighting. Too dark.
16. Lighting. Visible flash.
21. Too tightly cropped.
22. Nice image. I would clone out the distracting poles on the bottom of the image. Noise needs to be removed too.
24. Same as 1?

Some of the background images might be good for stock but I wouldn't submit them in the application. Overall, pictures 1, 7, 20, 22 seem like the most interesting, but I would submit a maximum of 2 or 3 for Shutterstock, or 1 for iStock.

I hope this helps.