You can use Library Search|Ketu to search for multimedia including images, photographs, video, audio and musical recordings. Just enter your topic into the search box on the main Library homepage.
Use Tweak My Results to restrict your search results to multimedia content types, e.g., Images, Videos.
Google is a wonderfully rich source of images. However, most of the images found on Google are copyright-restricted. To find images that can be used without breaching copyright, search Google (above) for your chosen topic, then click the Images link, then Tools, Usage Rights and select an appropriate filter:
Please remember to attribute (reference) your image source.