I don't think that a lot of people quite understand her. Many people think she does it because she thinks it looks 'stylish'. No, Helena Bonhem Carter is a women of quirk and art. She's married to Tim Burton! She steps out in these outfits to cause a stir, get the attention and be different. She doesn't want to mediocre she wants to be a stand out from the crowd. And her crazy and wacky style does that. It's who she is, and it's what she's about. People can't really critique her on the basis of her trying to look like a supermodel, because that is not what she is trying to achieve.
I like her, she's so weird and cool at the same time :)