In general, you will want to look for the following pieces of information when you are citing an image:
Creator’s Last name, First name. “Title of the digital image.” Title of the website, First name Last name of any contributors, Version (if applicable), Number (if applicable), Publisher, Publication date, URL. Access Date.
If you cannot find the information, you will simply skip to the next piece of the citation. For example, if you cannot find the creator, start the citation with the title. If the image does not have a title, describe the image instead.
Examples* (don't forget your hanging indent!):
Vasquez, Gary A. Photograph of Coach K with Team USA. NBC Olympics, USA Today Sports, 5 Aug. 2016, www.nbcolympics.com/news/rio-olympics-coach-ks-toughest-test-or-lasting-legacy. Accessed 24 April 2018.
Gilpin, Laura. “Terraced Houses, Acoma Pueblo, New Mexico.” Library of Congress, Reproduction no. LC-USZ62-102170, 1939, www.loc.gov/pictures/item/90716883/. Accessed 26 April 2018.
*examples used are taken from Manhattanville College Library.