When I see a novel adapted to TV or film, I sometimes wonder how closely the lead actor on the screen matches what the author imagined. Especially for the more closely adapted works.
Sometimes there are obvious liberties. Lord Vetinari, the Patrician in Terry Pratchett’s Discworld novels is usually depicted in official art as being extremely thin and having black hair. Yet when Going Postal was made, Vetinari (played by Charles Dance) is clearly blonde. Some fans did not like the change.