Figure 1. Cornelius W. Borah, Photographer, Two Unidentified Civil War Veterans, ca. 1880, photograph, Liljenquist Family Collection of Civil War Photographs. Library of Congress, Washington, DC, accessed May 17, 2019, https://www.loc.gov/pictures/item/2017660606/.

Figure 1. Cornelius W. Borah, Photographer, Two Unidentified Civil War Veterans, ca. 1880, photograph, Liljenquist Family Collection of Civil War Photographs. Library of Congress, Washington, DC, accessed May 17, 2019,https://www.loc.gov/pictures/item/2017660606/.

Figure 1. Name of Photographer, Photographer, Title of Photograph, year or era it was made, medium, Collection it is in or any identifying information. Museum or location where it is housed, Location, accessed date, URL where it can be found.

The Chicago Manual Online gives these instructions for citing photographs:

Give the name of the artist, the title of the artwork (in italics), the year it was made, and where it lives (museum, gallery, etc.). It’s fine to add other information if you know it, such as the size and medium. If you found it online, give the date you found it and the URL. If you found it in a book, cite the book and page number. You can put the information in a caption near the image or in an endnote or footnote. Images are not usually listed in a bibliography.

See the example below      from the NoodleTools Source Page.