Author-date citations are not normally used to cite images. Instead, put the full information about the image into a caption directly under the image or in parentheses within the text of your paper.
If a reference list is required, please see below.
Matisse, Henri. 1905. The Open Window. Oil on canvas. 55.3 x 46 cm. National Gallery of Art, Washington D.C. https://www.https://www.nga.gov/collection/art-object-page.106384.html.
Le Corbusier. 1943. Club de Centre Rural: Perspective Sketch. Art Institute of Chicago, Chicago. https://library.artstor.org/#/asset/AWSS35953_35953_41726393.
Matisse (1905) illustrates this...