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used: photoshop CS 4
Being someone who LOVES Avatar: The Last Airbender, as well as The Legend of Korra, I freaked out when I saw this (faint muffled squeals of joy were heard in Who-Ville, that day...).
Personally, I think the less detailing on the lower half worked out; despite the lesser amount of detail there, you were constant, making it work. It also draws more attention to her face/arm pose, which helps to focus the viewer's eye on the main subject: Korra.
Overall, it is a very nice rendition.
Anyway, if you wanted to make her white, make her white, it's your artwork, your time, your hand(or tablet/mouse), do what you believe is right and all shall turn out perfect. However try to please everyone else and it will surely end with a horrible result.~
But in any event keep doing what you're doing.~