Super Mario 3, revamped and extended

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I'g go for one or four, but with more contrast. Considering you're using black outlines, I'd say the dark shades should be darker in general. You also use a bunch of probably unnecessary colours, like the brightest green only used on the shell, the light blue used to shade the shell "brim" could be replaced with the gray from the handcuffs, the brightest skin tone is almost white and could probably be replaced, too. I find it hard to make out the light source, is it above, top-right, something? It's mostly inconsistend when you look at the shell and it's "brim" part.