had a look on one's face
彼女はまるで幽霊を見たような顔つきをしていた。
She looked as if she had seen a ghost.
彼は難しい顔つきをしていた。
He had a serious look on his face.
彼はまるで幽霊を見たような顔つきをしていた。
He looked as if he had seen a ghost.
彼女はそのとき恐ろしい顔つきをしていた。
She had a terrifying look on her face at the time.
彼は妙な顔つきをしていた。
He had a strange look on his face.