on his/her face
Se acercó a él con una sonrisa en su cara.
She approached him with a smile on her face.
Yo vi en su cara que no me reconoció.
I could tell from his face that he didn’t recognize me.
— Estación central de Brasil (1998)
Tom se salpicó agua en su cara.
Tom splashed water on his face.
I see it on your face.
Algo en su cara me recordaba verdaderamente a un viejo novio mío.
Something about his face really reminded me of an old boyfriend of mine.
No tiene ni rastro de arrepentimiento en su cara.
There's not a trace of regret on their face.
— Estrellas en la Tierra (2007)
Tom tiene algo en su cara.
Tom has something on his face.
Tom le estaba hablando a Mary con una sonrisa en su cara.
Tom was talking to Mary with a smile on his face.