I honestly hate those people who are like
"OMG THE MOVIE RUINED THE BOOK FOR ME CUZ THE CHARACTERS LOOKED DIFFERENT THAN WHAT I THOUGHT! THIS MOVIE IS HORRIBLY CASTED BECAUSE THEY LOOK DIFFERENT WAAAAAHHH"
That isn't how it works. The casting director doesn't go inside your brain and look for the actor that looks exactly how you imagined him or her.
Stop it.