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Many internet images can be used for educational purposes according to the new Fair Dealing guidelines. Check out our advice for using internet images for students and faculty.
you have to cite the material
you can’t use the material if there is a lock on the website, like a password preventing the general public from accessing it
Welcome to Smithsonian Open Access, where you can download, share, and reuse millions of the Smithsonian’s images—right now, without asking. With new platforms and tools, you have easier access to nearly 3 million 2D and 3D digital items from our collections—with many more to come. This includes images and data from across the Smithsonian’s 19 museums, nine research centers, libraries, archives, and the National Zoo.
Retrieves results from the creative commons Flickr bank as well as Google images that are "labeled for commercial reuse with modification" and more. Select the IMAGES link on the left hand menu after searching.
Photo library with access to thousands of high quality public domain photos, and Creative Commons images via Flickr. Edit photos before downloading, or submit your own to the platform.
Feature Site: Getty Images With Open Embed
Getty Images has dropped "the watermark for the bulk of its collection, in exchange for an open-embed program that will let users drop in any image they want, as long as the service gets to append a footer at the bottom of the picture with a credit and link to the licensing page." (The Verge)
Here is an example of what an image with an embed code would look like.