A person's facial expression or the look of their face; the features or countenance that show mood or character.
彼の顔つきが急に暗くなった。
His expression suddenly grew dark.
その子はまだ幼い顔つきだ。
That child still has a youthful/childlike face.
面接では緊張した顔つきが見えた。
I could see a nervous expression during the interview.
祖父の顔つきには家族の面影が残っている。
My grandfather's features still show the family's resemblance.