I've seen one guide in the appearance of actor Stephen Fry. I realized it was
not the actor himself, but some kind of disguise from guide(s).

I think I was shown S Fry because he seems to be a sane and reliable person
in my opinion, so the guide(s) showed me S Fry on several occasions, to put
some more emphasizes on the impressions I received, as they could feel
that I trusted S Fry more than I would trusted an unknown person.

So if you see a face of a person, it could be because of a variety of reasons.

Sometimes I think I see someone close up, only because what follows next is
important, and I should pay more attention to it. Sometimes I think it's more
of an exercise thing, I feel like I'm into some kind of training.

Perhaps you could think about what feelings you get when you see the face
of the person? What is related to that person?