We reserve the right to delete any image at any time for any reason. That said, our main concerns are that the image not be copyrighted material, and be in 1080p (1920x1080) format.
As far as we're concerned, you retain copyright on your images, but grant us the right to modify your images for display on our website. We will only create thumbnails of varying sizes, we do not apply watermarks or stamps or other alterations - although you're welcome to mark your own images as you see fit (Giles marks his images, Alex does not). Of course if you're seriously attached to the integrity of your images, DO NOT POST THEM HERE. We are NOT responsible for what our visitors do with your pictures! And if you seriously believe retaining copyright on an image posted to the internet means anything, you don't know much about the internet.