You can find images of fruit flies on EOL.org, which hosts over 200 pictures of fruit flies. To find the highest volume of fruit fly images, you can also do a Google image search for fruit flies.
Most of the online articles and websites pertaining to fruit flies focus primarily on fruit fly eradication and typically display only one or two images. TheBugSquad.com is an exception, as it displays three close-up images of adult fruit flies as well as images of fruit flies in their egg, larvae and puparium states. Additionally, exploratarium.edu showcases a lengthy gallery of regular and mutated fruit fly images for comparative purposes.