11. CC Images
flickr photo by my dog sighs https://flickr.com/photos/mydogsighs/15843066368 shared under a Creative Commons (BY-NC-SA) license
flickr photo by oddsock https://flickr.com/photos/oddsock/5464297841 shared under a Creative Commons (BY) license
commons.wikimedia.org/wiki/File%3ALeonardo_da_Vinci_-_Mona_Lisa.jpg
flickr photo by Joelstuff V4 https://flickr.com/photos/joelshine2/4419616322 shared under a Creative Commons (BY) license