Wow! That's really good, you hardly need help, in my opinion :p
One thing about MC style is that the outlines aren't all one color. If you look closely at the outline of something, at the point where the light is coming from, the outline will be a shade lighter. Like, the outline of Link's cap is dark green, except on the top edge (the light is coming from above), where the outline is a medium green.
Another thing is that the shading is a little inconsistent. On the spirals, the top should be lighter than the bottom, rather than the outside darker than the inside. Unless I just don't understand the dimensionally of this monster! :p