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Severus should be exactly like that - with long, greasy hair.
Voldemort - with an ugly snake-like head.
Dumbledore - with a long beard and glasses.
I don't remember the description of the others.
Harry's aunt - a Soviet school teacher. In the book, she's a blonde; in the movie, her hair is mouse-colored.
Draco's mother - in the book, "almost a beautiful blonde, if it weren't for her contemptuously twisted face"; in the photo, it's Sergei Rost from "Modern" made up to look like a woman.
The red-haired father - "thin, wearing glasses, with a receding hairline." In the movie, he's a chubby, nondescript neighbor-alcoholic in some damn onion-shaped hat and with a dirty face. Without glasses, of course.
Mad Eye - a face with scars, gray hair, a magical eye, a broken nose. In the movie, he's a cheerful fat man, looking exactly like the guy who plays in silly comedies, like in "School of Rock," I don't remember his name; with a pirate eye patch.
Neville Longbottom - "a round-faced grandson"; in the movie, he's a skinny nerd with protruding rat-like teeth.
And the list could go on for quite a while; there are many such things.