I saw his/her face
No le vi la cara.
I didn't see his face.
— Oldboy: Cinco días para vengarse (2003)
Le vi la cara y supe inmediatamente que algo andaba mal.
I saw his face and knew immediately that something was wrong.
No lo sé, no le vi la cara.
I don't know; I didn't see their face.
— Harry Potter y la piedra filosofal (2001)
Le vi la cara.
I saw his face.
— Atrápame si puedes (2002)
Nunca le vi la cara.
I never saw his face.