Have you ever been "Catfished"? That is, has anyone tried to pretend to be someone else? You can use image search to make sure that picture is real.
Here are a few pics extracted from larger images. PicLookup can find these and show you the original pictures. To see, just copy an image and paste it into the search page. Then compare your results with other search engines. Last we checked, the big search engines couldn't find these faces, even though they can find the complete picture. But it's the little pictures that get used for catfishing.

These sample cutouts were taken from images available for research from The MIRFLICKR Retrieval Evaluation site.
They appear on Flickr at the urls listed (which you will also see if you search for them on our home page).
And here is the copyright license posted at Flickr.