As the tittle suggests I'd like some advice on converting two corsairs to captains and one to bo'sun. Well, I don't want them looking the same as ither warriors and they can't be painted very differently. And how do you even convert a bo'sun and know that he's actually a bosun and not a captain?

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current armies: wood elves/galadhrim, easterlings, mordor.
high elves and azog's hunters are on the way...