Adam, Eve, and the Serpent
Relief on the right portal of the west façade
Amiens Cathedral, France
This is an early example of including a serpent with the face of a woman in the traditional iconography of the original sin. As the serpent whispers in Eve's ear she simultaneously eats one of the fruits from the tree and passes another to Adam. As is very common, the artist anachronistically adds the fig leaves that come only later in the narrative.
Read more about images of Adam and Eve.
Source: this page at Wikimedia Commons.