If you OWN the photo, meaning owing the rights to it. Some photographers that sell photos are selling them for private use only, not distribution. Before you submit a photo that you did not take personally with your own camera I would check with the photographer. Obviously professional shots are ideal since we are looking for the best shots possible.
Like Wdeerfield said, you can have the photographer sign the release form if he is ok with the photo being used for this purpose. Several entries did that last year and it worked out fine. We are basically just looking for permission to print and distribute the photo.
Hope this clears it up for you guys. Let me know if you have any more questions.
Last edited by jbaier; 09-10-2012 at 04:03 PM.