on his/her face
Le mutande della vittima sul suo volto, come con Hyang-sook.
The victim's underwear on his face, like with Hyang-sook.
— Memorie di un assassino (2003)
Lo sguardo sul suo volto era impagabile.
The look on his face was priceless.
Giudicando dall'espressione sul suo volto, lei era preoccupata.
Judging by the expression on her face, she was worried.
It's written on his face.