'BUT Jane is supposed to be plain too and the actress in this is lovely.'
Not really. She is young, which was the point of Jane, even. She has the look of Jane, mouse brown hair, short, pale, slender build and green-eyed. Most girls that age fitting such a description are lovely in that they have a freshness about them which is utterly irresistable, especially if they are of good nature, which she was. They have skin to die for, British girls that age, like cream. Jane also had a lack of self-assurance that is like flies to honey for men like Rochester, even now.
The innkeeper at the end said it best, 'Mr Edward was about forty, and this girl not yet twenty, and when gentlemen of his age fall for girls, they are often as if bewitched.'
Her youth is what is lovely.
But Edward is supposed to be assymetrical, disproportionate (barrel-chested, with legs shorter in relation) and not that tall.
Michael Fassbender is very, very beautiful. He is tall, with startling blue eyes and you could draw a line down the middle of his face and see the same on either side. BUT, he is also a very good actor, so perhaps he pulls it off.