For help in determining if you can use an image, graph, or table in your paper or presentation take a few minutes to go through the Fair Use Quiz from MIT Libraries.
Harris LE. Copyright law and legally using images in slides and presentations. [28 November 2016] copyrightlaws.com.
Always consult copyright information for each site before using images, site your image source, and use images for educational purposes only. You can limit Flickr or Google image searches by usage rights or copyright restrictions.