When you find a book on your topic, check to see if the book includes illustrations, maps, photographs, or other visuals. These sources are always cited, so you will be able to re-use them for your own projects.
Use advanced search options in Google to look for digital archives for your topic on the open web. For example:
Last name, First name. Title of Work. Date of creation or completion. Medium. Name of Institution. Location (if applicable). URL.
Ferrara, Daniel. The Flock. 1970. Painting, 25.5x32in. https://library.artstor.org/asset/ARTSTOR_103_41822000454452.
Always cite your sources, including visual sources such as films, images, artworks, photographs, data, charts, etc. If you find an image on a website, and there is no attribution, meaning you cannot find a citation, try to find where it originated and who created it. In general, when choosing visual resources:
Look for an attribution or citation.
If possible, find the original creation and creator.
Cite the visual sources you use in your project.