That is the problem I recently had when I wanted to submit a photograph of a sea plane I shot while out sailing. The problem was that when I blew up the photo to 100%, I could clearly see the passengers faces in the back of the plane.

© Bwendy3 (Help)

I really wanted to use this photo as there are not a lot of them on Dreamstime. To fix this problem I modified the photo in Photoshop and made it look like the plane had tinted windows. My photo was accepted and I averted the problem.