In your Works Cited, you'll want to include as much of the information below as you can:
Creator's last name, first name. Title of Image or Description of image. Date the image was created. Museum, City. Database Name or Title of Website. Date of access.
Example: Ernst, Max. Age of Forests. (1926). Albright-Knox Art Gallery, Buffalo, New York, USA. Art Museum Image Gallery. November 7, 2017.
For a work of art or photograph that exists only on the web, the citation will look like this:
Creator's last name, first name. Title of Image or Description of image. Date the image was created. Title of the Website where the image is located. Publisher or sponsor of the site (if available). Date of access.
Ferrer, Christian. Marina (ship, 2011). Sète, Hérault, France. (2011). Wikimedia Commons Picture of the Day. November 19, 2017.
Remember, the primary purpose of citing references is to help the reader find the original sources.