How do you visualize a character in your head?

I tend to pick famous actors who fit the description of the character in question. Or I just use a actor/actress that I've seen recently in a movie or a TV series. Exemples:

• When I read Stendhal's Le Rouge et le Noir (1830), Paul Dano was Julien Sorel;
• For Jonathan Littell's Les Bienveillantes (2006), I used Michael Fassbender to play Maximilien Aue;
• For Victor Hugo's Les Misérables (1862), I kinda blended two adaptations: Hugh Jackman as Jean Valjean (but visually closer to how he looks in films such as Prisoners and Logan than what we see in the 2012 movie, especially considering that Jean Valjean is basically Wolverine without claws in 19th century France) and Geoffrey Rush as Javert (but also visually different from his appearance in the 1998 adaptation);
• I read Thomas Mann's Doctor Faustus (1947) in 2019, when Joker was about to be released (I started like a month before or so). I noticed how Mann always describes Adrian Leverkhün smiling and laughing sarcastically and cynically (at least that's how I interpret it). Arthur Fleck in Todd Phillips's film is always linked to music, he' always uses singing and dancing as a a form of emotional discharge. Leverkhün is a musician in Mann's novel. So my mind naturally linked the two things: Joaquin Phoenix was Adrian in my mind.

And what about you, how do you visualize characters in your head? You do the same thing I do? Do you try to create an entire different face only based on the description provided by the author, without any real-life figures as references?