The description of Dudley Dursley. Please, check my story for errors
Description's of Dudley's appearance are contained in a few lines from Chapter two of Harry Potter and the Prisoner of Azkaban. Dudley has piggy little eyes and porky shoulders. Thick blond hair plastered flat to his fat head, a bow-tie just visible under his five chins. Undoubtedly, he is healthy-sized boy.
If I compare Dudley from books and films, I find many differences. Dudley has dark hair, nice blue eyes and two chines, not five, in the third film.
When I read the book I imagine Dudley as a very fat and nasty boy who looked and acted like a pig.
Dudley is more pleasant to look at in the movie. Yes, he is also a healthy-sized boy, but he doesn't look like a pig.
This did not surprise me, because characters in movies often look better than in the book. An ugly character scares the audience away from watching movies.