He is in the pink.
脸色粉嫩
In the pink
表示很健康。
When she makes errors, she becomes red in the face.
她只要做错事，脸马上就会变红。
See red
非常生气，暴跳如雷
People who spit on the street really make me see red.
看见随地吐痰的人真的让我很生气……
yellow
象征胆小鬼。
Yellow bellies
胆小鬼。

Be feeling blue =have the blues
感到忧郁。
I'm just feeling a little blue
我就是感到有点忧郁。
Talk until one is blue in the face.
为了说服对方，说得脸色发青。
He talked until he was blue in the face, but he couldn't convince his wife.
他好说歹说，还是没能说服他的妻子。
He was green with envy when he saw my new car.
他看见我新车，嫉妒得脸都绿了。
Black and blue
青一块紫一块
His face was black and blue.
他的脸青一块紫一块。