To raise one's face/head; literally to lift one's head or to look up. Figuratively, to hold one's head high or act confidently.
写真を撮るから、もう少し顔を上げてください。
We're taking a photo, so please raise your face a bit more.
失敗しても顔を上げて前に進もう。
Even if you fail, hold your head up and move forward.
子供が力強く首を上げて、初めて顔を上げた瞬間だった。
It was the first time the baby lifted its head strongly and raised its face.