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I mean, which movie are we talking about here?
I'm not doubting that Peter Jackson did a decent job with LoTR, but I think its a good thing that MtG has gone in a different direction. Historically, all book to movie and/or art translations have to add a huge number of details. The above picture is who we had for Boromir for decades prior to the Peter Jackson films, for example.
Ultimately, the books just don't have a complete picture of Boromir, or any of these characters for that matter. There's a huge amount of variation available to the artists with regards to how they can be rendered.
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Aragorn's cape is always white in this set. With regards to the artistic style of the _set_, Aragorn does not look like Boromir at all. Not in skin color, not in costume, not in anything. There's no reason why Boromir has to look like his 1978 version, or in his 2001 version.
In any case, art style between cards is never perfectly consistent, because MtG can only make these large number of cards by contracting many, many different artists. Going back to Innistrad... lets take a look at Saint Traft.
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Characters look different when drawn by different artists. Keeping the same hairstyle and costume is usually the best we get with regards to the same character over multiple cards, especially if they're a character of secondary importance.