Personally I give each character a face, either from a person I know who matches their personality or a celebrity that fits the description, even though sometimes it can be really annoying if the author gives more details on the persons appearance and my character doesn’t fit that lol. I’m very curious as to what other people do.
I just work off of what the author gives me, if they don’t give me much, my imagination will simply fill in the blank somehow. I think I have a kind of gallery of stock “types” in my head that I can pull from to match a face to a name if I have to.