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Yeah that really does look nothing like Majora's Mask. I'm going to have to dismiss this one.

That is easy. Just upload the image to a site such as http://imageshack.us or http://photobucket.com. Once you do that just put the url of the image in [img] tags.

No, I don't think the Gerudo were the ones who used the mask. If they were, they wouldn't be in the game, since it was an ancient tribe, or at least I remember it to be. I'd have to see a picture of what you're talking about to truly evaluate it. Until then, I can only say that it's a coincidence.