MLA Style
When citing an image, the caption should be labeled as Figure (usually abbreviated Fig.), assigned an arabic numeral, and given a title or caption. For photos of artwork, include the book's publication information of the text in which the image appears. A label and title or caption ordinarily appear directly below the illustration and have the same one-inch margins as the text of the paper. Captions should be numbered consecutively.
Source: Gibaldi, Joseph. MLA Handbook for Writers of Research Papers. 6th ed. New York: Modern Language Association of America, 2003.
Fig. 1. Mary Cassatt, Mother and Child, Wichita Art Museum. Illus.in Novelene Ross, Toward an American Identity : Selections from the Wichita Art Museum Collection of American Art (Wichita, Kansas: Wichita Art Museum, 1997) 107.
Art Bulletin Style
The College Art Association's AB style is a modification of the Chicago Manual of Style. Captions should be numbered consecutively. Figure numbers do not include a period.
A full caption includes, whenever available & appropriate, information in the following order:
Figure number with no period
Artist
Title (in italics)
Date
Medium on support
Dimensions in inches (h. x w. x d.) followed by dimensions in centimeters (1 inch = 2.54 cm)
Name of collection
City of collection
Other collection information such as "gift of . . . ," accession number, etc.
Copyright or credit-line information regarding both the photograph and the artwork (in parentheses)
Caption written in AB Style:
1 Mary Cassatt, Mother and Child, ca 1890, Oil on canvas, 35 ½ x 25 3/8” (90.1 x 64.5 cm). Wichita Art Museum, Whichita, Kansas, Roland P. Murdock Collection, M109.53
( © Wichita Art Museum 2002 )
Further examples and exceptions are available on CAA's Guidelines page under, Captions