his facial expression
値段を伝えたときの彼の表情、よく見ておいてよ。
Make sure you watch his face when you tell him the price.
彼の表情には恐怖が表れていた。
Fear was evident on his face.
彼の表情は憎しみに近いものだった。
His expression was something close to hatred.
彼の表情は厳しかった。
His expression was stern.