好熟口面 英文可以點講

1) Quite familiar with or quite acquainted to;
2) That actor is very acquainted to me but didn't remember which movie he played;

Apart from 'looks familiar', you can use the more playful 'rings a bell'.

That actor rings a bell. I think I've seen him in a film before but I'm not sure which.

simply say "looks familiar"

This actor looks so familiar. It seems like he plays in some other movie too.

好熟口面 = The face looks awfully familiar.

"你睇戲見到個演員好熟口面,好似演過唔知邊套戲" ~ 可以點講?

(1) 你睇戲時見到個演員真人
You met the actor (actress) when you went to see a movie. His (Her) face looked awfully familiar. Perhaps he (she) once performed in a movie you couldn’t recall.

(2) 你睇戲時在電影裡見到個演員
You saw the actor (actress) play in the movie. His (Her) face looked awfully familiar. Perhaps he (she) once performed in another movie you couldn’t recall.

The artist, whom I have met at the cinema, looks as if I have seen him in another movie.

OR

The artist, whom I have met at the cinema, looks familiar. Perhaps he has performed in other movie.