Researchers in the field of Art History use the Chicago Manual of Style (Humanities).
The Academic Resource Center (ARC) offers free writing consultations for students. Their experienced tutors can advise you at any stage in your writing process:
If your paper is in MLA, ask for an MLA-style writing tutor to ensure that your tutor is knowledgeable in this format. Please call the ARC at 310-338-2847 to set up an appointment.
Fig. 1. Giuseppe Arcimboldo, Vegetable Gardener, 1580's. Oil on panel, 35.8 x 24.2 cm, Museo Civico Ala Ponzone di Cremona. Reproduced from ArtStor, http://www.artstor.org (accessed Febuary 22, 2009).
To cite your image in-text:
Reference illustrations with a parenthetical reference at the end of a sentence, including the abbreviation for figure in lowercase letters, as follows (fig. 1).
If you reproduce images from a print source then replace the "Reproduced from ArtStor" credit line at the end of the caption with a credit line for the book, with page number, as below.
Reproduced from Werner Kriegeskorte, Giuseppe Arcimboldo, 1527-1593 (Los Angeles: Taschen, 2004), 72.
(Originally adapted from CiteSource at Trinity College [no longer supported link], please refer the libguide from West Virginia University with similar information and this tip sheet from the Chicago Manual of Style of how the figures should look on your paper)