Photographers, these wonderful people that help make our world a prettier place, should naturally only have their work used as licensed and be given all the credit that is them due. However note that it is believed that the use of scaled-down, low-resolution images of posters and other promotional material from a film to provide critical commentary on the film in question, not solely for illustration, qualifies as fair use. And quite frankly, as long as I encourage people to watch the movies, I suspect that is what posters are for.
Photo at the top of the page called The Experiment (showing interior of cellblock at Ohio State Reformatory, Olivesburg Rd. Mansfield where part of “The Shawshank Redemption” was filmed) was taken by Brenda Gottsabend – Own work, CC BY-SA 3.0, Original photo.
Photo at the top of the page called Contact (showing a crowd lining up to see “Gone with the Wind” in 1947) was taken by Florida Memory – Crowds line up to see “Gone with the Wind” – Pensacola, No restrictions, Original photo.
Photo used in fav-icon by the side of the url in the browser (showing the number eight) is taken by Ryan Baxter (Originally uploaded to Flickr as Eight) and has a creative commons license: [CC BY 2.0], via Wikimedia Commons.
Photo used as profile picture for stolennaps (showing a mushroom, Amanita Muscaria) is taken by Tony Wills and has a creative commons license: [CC BY-SA 3.0], via Wikimedia Commons.