If you're not someone's identical twin, you can't look exactly like that person, of course. But if someone is playing a real-life person, they often want the person to look as close to that person as possible that you can believe it's that person. Eye color is too prominent of a feature. If the eye color doesn't match, the person won't convincingly look like that person. Sela Ward played Jessica Savitch in a TV movie. They dyed her hair very blonde, but I couldn't believe it was Jessica with Sela's eyes as dark as crude oil. And Jim Carrey is very tall with dark brown eyes, and played someone short with blue eyes. Though Jim put his heart in that role, the appearance was too different.
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