Butterflies can make their wings look like a face with its eyespot (sometimes ocellus). It is an eye-like marking. The one in the photograph looks like it also has an eyebrow.
They are found in butterflies, reptiles, cats, birds and fish. Eyespots may be a form of mimicry in which a spot on the body of an animal resembles an eye of a different animal. Its purpose is to deceive potential predator or prey species; a kind of self-mimicry, to draw a predator’s attention away from the most vulnerable body parts; or to appear as an inedible or dangerous animal.
Read more about eyespots here: Wikipedia