face

a long face (=an unhappy expression  

 pull/make a face =change your expression to make   

 people laugh or to show you are angry, disappointed    

 etc  

a blank face (=an expression that shows you do not know or recognize something)  

a face like thunder =a very angry expression   

somebody's face lights up/brightens (=they start to look happy)  

somebody's face falls (=they start to look unhappy) somebody's face darkens (=they start to look angry or threatening) 

see something in somebody's face show in somebody's face something is written all over somebody's face =something is obvious from someone's expression 

you should have seen his/her face spoken (=used to say that someone was very angry, surprised etc)  

the look/expression on somebody's face a smile/grin/frown etc on somebody's face