Include the artist's name, the year the work was created, and the institution (e.g. gallery or museum) that houses it (if applicable), followed by the city where it is located.
Include the complete information for the site where you found the image, including the date of access.
For example:
Rembrandt, Harmens van Rijn. The Return of the Prodigal Son. c.1665. Oil on canvas. 264x60cm. The State Hermitage Museum, St.Petersburg. The State Hermitage Museum. Web. 17 June 2009.<http://www.hermitagemuseum.org/html_En/03/hm3_3_1_4d.html>