The Chicago style of citation are used in both the humanities and social sciences. While it is the preferred style in art and art historical research, always check with your instructor to determine which citation style you should use during your research.
It can be tricky to understand issues surrounding copyright and fair use, especially as it concerns art and visual imagery. What kinds of things are under copyright? What does it mean for something to be fair use? What is creative commons? Please look the the guide Copyright Across Campus for further information on these issues.