When you use images from the internet, it is your responsibility to credit the artist or the source of that image. When possible, include credit alongside the image.
Robison, “Monstrosi-tea”, digital image
General Format for Bibliography:
AuthorLastName, FirstName, “Title”, ResourceType, Publication Date, Access Date, web address
Robison, Joel, “Monstrosi-tea”, digital image, 2015, https://www.flickr.com/photos/joel_r/20758543573/