I wasn't quite sure what was meant by rework, but I interpreted it as seeing how I would draw one of my old drawings today. I picked something I drew six years ago, and it ended up evolving quite a bit away from the original.
I wasn't happy with how harmless he looked, so I gave him bigger teeth, picked a more interesting pose and really tried to get the anatomy right, which I think I learned a lot from. I also ended up changing the palette quite a bit. I tried to not use any dithering for once, since the shading in the original is pretty clean.
The anatomy still needs work in places, and I still have a color to spare that I might make use of later.
Big thanks to ptoing and Womped and everyone who helped me with this at Pixelation.
Edit: Increased saturation on skin tones to compensate for the green AA, toned down parts to make it less cluttered and added another skin shade.