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In order to properly credit an image, you need to gather as much information as you can. Once you've located the original source for an image, try to find the name of the person who created it. This could be the name of the person who runs the website where the image is hosted. This could be a username (especially if the image originated on tumblr, pinterest, or other social media sites). Look for a caption, scroll over the image to see if additional information comes up, or attempt to save the image to see what the file is named. If possible, try to determine when the image was created. If the image in question is a representation of an existing artwork or photograph, include the date that the original work was created. If you are working with a web-only image, see if the website hosting the image has information about image usage or copyright. You may be able to find the date of creation there. If you are citing an existing artwork, an internet search should be able to tell you the date of creation. If you are citing an artwork, you'll also need to mention where the original piece is held. List the name of the gallery, library, or museum. Also, list the city where that institution is located. For instance, if you're talking about Dali's The Persistence of Memory, a quick internet search will tell you that it is held at the Museum of Modern Art in New York. Write down the name of the website and/or database where you located the original image. If the website is run by an organization, sponsor, or publisher (such as as a university press), you'll need to record that info as well. Materials online are changing all the time. As such, it is important to note the date of access for an image (the date when you saw and/or downloaded it). Including this is not always required, but it helps add credibility to your citation.
Determine the image creator's name. Find out the title of the image. Determine the date the image was created. Figure out where the original is located. Record the place where you accessed the image. Record the date when you accessed the image.