If you back up from it or see it reduced, it looks like Marilyn Monroe.
This illustrates a phenomenon that portrait painters often notice. As you back up from a portrait, the eyes can seem to shift direction, the expression seems to change, or the whole likeness alters.
"The work of Aude Oliva and her colleagues at the Massachusetts Institute of Technology, the illusion was created in three steps. First, the researchers obtained a photograph of Marilyn Monroe and removed the fine-grained facial features, such as any wrinkles or other blemishes.
Second, they obtained a photograph of Albert Einstein and removed the more coarse features, such as the shape of the mouth or nose. Finally, the two images were superimposed on top of one another. Because the fine-grained features are visible close up, the image looks like Albert Einstein when you're just a few inches away from the page. However, move a few feet away and suddenly only the coarse features are visible, magically transforming the image into Marilyn Monroe."
More great illusions at the Mail Online
Thanks, Beaman Cole!