还是右上角那个astonish的表情最给力了!
grimace n. 愁眉苦脸;(做作出来的)怪相;鬼脸 v. 做鬼脸 ; 皱着眉头,作怪相

Their faces turned to grimaces while they were enjoying the sunshine on the beach.
他们在海滩上享受着日光浴时，一个个的表情都变成了鬼脸。