If the image is only found on the web, provide the name of the artist, title of the work then follow the citation format for a website. (Remember to delete "http://" from the address, it is not needed and makes the citation easier to read.) If there is no artist information leave it out.
If the the picture was found using Google do NOT cite Google as the publisher, visit the original page and use information from the website that is hosting the picture.
Basic Format:
Last Name, First Name. "Title of the Image."Title of Website, Version (if applicable), Publisher, Publication Date, URL.
Example:
Souza, Pete. "President Obama, Vice President Biden and Members of His National Security Team."PHOTOS: One Photographer's 'Remarkable' Chance To Cover ThePresident,NPR, 26 Oct. 2016,www.npr.org/2016/10/26/499490029/photos-one-photographers-remarkable-chance-to-cover-the-president.
Instagram Post:
(If the work is posted is under a username, use the username for the author. If there is no title for the image provide a short description (some people use the first few words of the image caption.) Since it is technically a description and not the official title it does not get quotes around it.)
Dressed_Podcast. 20,000 followers!Instagram, 8 Jan. 2019,www.instagram.com/p/BsYKpQkADCr/.
Artwork from Museum Website:
van Gogh, Vincent. "Self-Portrait with a Straw Hat (obverse: The Potato Peeler)." TheMetropolitan Museum of Art, 1887, www.metmuseum.org/art/collection/search/436532. Accessed 3 Jan 2019.