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Wow.
First off what is it.
Second, the outline looks good to me. Better than anything I could've done.
Ah, I meant the chunk that I outlined in red (or, wait, does red green color blindness mean you can't see red? I'm unfamiliar with that sort of thing xD;; In any case, the bigger rectangle) looked like it was missing. But when I zoomed in I could see the outline there; the piece that I outlined in purple should be smoothed out, so it isn't so square. Right now it looks like you accidentally took the eraser and erased something, but if you smooth out that square, it will look a lot more natural.
I still think you need some darker outlines, though; on the left edge of the first frame, I can't see the outline, and it detracts a bit from the sprite.
Hmm, I think I see how the arms work now...