When you mention or discuss a work of art, it is not customary to provide a reference for the work of art in a footnote, and it would certainly not be listed in the bibliography at the end of your document.
However if you include illustrations of works of art in your document, you will need a caption which identifies the work, and you will need to identify the source from which you obtained the illustration.
Where possible, the caption should include: name of artist, title of work (in italics), date, medium, where located. This should be followed by details of the source (book, website, etc.), from which you obtained the image, using standard bibliographic details as specified elsewhere in this guide.
Examples:
Figure 3. R. Godfrey Rivers, Under the Jacaranda, 1903. Oil on canvas. Queensland Art Gallery. Reproduced from Queensland Heritage, Queensland Art Gallery, accessed September 7, 2010, http://qagoma.qld.gov.au/collection/queensland_heritage/r._godfrey_rivers.
Figure 8. Giotto, Christ before the High Priest, ca. 1305. Fresco. Arena Chapel, Padua. Reproduced from Martin Kemp, Leonardo da Vinci: The Marvellous Works of Nature and Man (Oxford: Oxford University Press, 2006), 3.