word of advice, ditch the red in the second sprite and replace it with the purple you already have, that way you'll actually have a NES-working sprite, as well as trying to get more contrast between the white and gray shades you got on that one.
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how it looks. This was also used by my Chill Penquin in Megaman 1-6 style.
@Metaru. Oh I think the grey shading made for Armored Armadillo better.
But I have no time to make him better. 