The face of the Evil One. (TV: The Face of Evil)
The face was the location of several sensory organs on animals, including the eyes, nose and mouth.
River Song was able to tell, by looking at him, that the Tenth Doctor was more youthful than any of the incarnations she had previously encountered, telling him: "going by your face, I'd say it's early days for you". (TV: Silence in the Library)
A catastrophe on the Chameleons' homeworld resulted in the loss of their faces and their identities. (TV: The Faceless Ones)
The Jukstans were a humanoid species which naturally lacked faces; they communicated telepathically. (PROSE: The Vampires of Crellium)
The face of the Evil One was carved into rock on the planet of the Sevateem. The Fourth Doctor was surprised when he first saw it, as it was his own face. (TV: The Face of Evil)
Rose, after the Wire stole her face. (TV: The Idiot's Lantern)
The Wire stole the minds and faces of a number of people she consumed in 1953 England. While their faceless bodies were left inert, the consciousness of those absorbed were left inside television sets hidden at Magpie Electricals. They were restored when the Wire was defeated by the Tenth Doctor. (TV: The Idiot's Lantern)
In the 51st century, people donated their faces to the Library where they appeared on Nodes and performed an interface function. (TV: Silence in the Library)
After a Spoonhead absorbed someone's mind, their face was visible on a television screen in the Shard. (TV: The Bells of Saint John)
The Valeyard's TARDIS appeared as a stone sarcophagus with the Doctor's thirteen faces engraved in it. (PROSE: Matrix)
Ursula is absorbed into the Abzorbaloff's body, joining past victims in various states of digestion. (TV: Love & Monsters)
The faces of those absorbed by the Abzorbaloff were embedded into his flesh, an irreversible process. Initially remaining conscious for several weeks, remnants of faces were present for a time after death. Most uncomfortably, the face of Bliss ended up in his posterior, which the Abzorbaloff revealed to LINDA by turning over and farting on Bliss' face before sitting back down. Ultimately, they were all dissolved along with the Abzorbaloff's body when he was absorbed into the Earth, while the face of Ursula Blake was preserved into a pavement slab by the Tenth Doctor. (TV: Love & Monsters)
When the Tenth Doctor talked about his previous incarnations, he talked about wearing, or having other faces, rather than using the term incarnation. (TV: The End of Time)