The third group of images for the Sanctuary Image Contest has now been released! See the full list of images you are required to take here. The full rules for the contest can be found in this dev blog. You can discuss the contest in this thread.
Remember, if you haven't finished the first or second week of images, you still have until the end of July to go out, snap those screenshots, and get free stuff and a chance to have your name permanently engraved on a new site in New Eden!