This guide is intended to help you find images on the web that could prove useful to you in your study and research. Images, like text, may be copyrighted, so always ask permission from the source before you use an image. In addition, be sure you properly cite the image source in any paper or classroom presentation.
The Smithsonian Institution releases 2.8 million images into the public domain for users to use, reuse and download free of charge. For more information and to access, go to https://www.si.edu
The National Gallery complete illustrated catalogue on CD-ROM