According to MLA format:

Cite the artist's name, followed by the title of the artwork(underlined), and the institutiion and city where it can be found. If you wish to include the art's date, it should go after the title.

Sample:

van Gogh, Vincent. The Starry Night. 1889. Museum of Modern Art, New York.


If this would be a piece you viewed online, you would end the citation with the date accessed and the URL

Sample:

van Gogh, Vincent. The Starry Night. 1889. Museum of Modern Art, New York, Feb.3. 2003 http;moma.org/collection/depths/paint_sculpt_0003.htm



When writing about a piece of art you italicize or underline its title.
Photographs, on the other hand, just use quotes around the title.





Fleming, Grace. "Punctuating Titles: Underlines or Quotations?"
MLA Biography Guide//. n.d. http://homeworktips.about.com/od/mlastyle
/a/titles.htm May 27, 2010.

Answerbag.com. http://dianahacker.com/resdoc/humanities/list.html Nov. 15, 2005. May 27, 2010.