According to copyright.gov "Copyright, a form of intellectual property law, protects original works of authorship including literary, dramatic, musical, and artistic works, such as poetry, novels, movies, songs, computer software, and architecture."
How do I know if something is still under copyright? There is a chart for that, created by Cornell University.
To learn more about Creative Commons licenses watch Creative Commons Kiwi by Creative Commons Aotearoa New Zealand.You might also explore the CC website, see who uses CC licenses, or try building your own Creative Commons license.
Citing Photographs: Chicago from the Library of Congress guidelines and examples for citing photographs from the web.
Citing Photographs: MLA from the Library of Congress guidelines and examples using MLA.