Some sites, like Artstor, will generate URL's for specific images as well for inclusion in your citations. On Artstor's site, you'll find a listing of standard formats for image citations.
Photograph of Allan Houser working on his mural Breaking Camp During Wartime, which he was painting on the north wall of the then-new Indian Arts and Crafts Room of the Department of the Interior Building, 1939. Image Source: Artstor.
Kay Walkingstick, Talking Leaves: You're Not an Indian. You Weren't Born on a Reservation!, 1993. Image Source: Artstor.
Did you know? The images and other media you find online are most likely protected by copyright, regardless of whether any copyright statement is displayed. Copyright protection applies instantly and automatically when a new work is created; no copyright notice or registration is required!
Learn more about using images legally from this guide: Using Images: Copyright Guidelines for the Use of Images in Education