Access thousands of images from art, architecture, archaeology, decorative arts and design, and visual culture in general. The content comes from museums, individual photographers, scholars, special collections at libraries, and photo archives. (ITHAKA)
The following link takes you to a site with great examples of how to cite images using Chicago Manual of style in your papers. You can also consult the Chicago Manual in sections 12.31 - 12.51 for directions on how to write captions and credit lines.