As I see it (this might be subjective due to calibration, but still), Helm's edit does look better at 1x, due to the higher contrast, but loses its flair quickly at 2x. Ryu's edit is a little dark, but it does stay a lot smoother in the 2x and 3x zooms. I suggest he keeps the same ammount of colors, but adds the contrast we find in Helm's edit.
I also liked the distinct colour spaces Ryu provided. I see the harmony in using a unified palette, but is it always the solution?
You still need to work on the limbs, I find them to be very rubbery and elongated and generally broken. You can pull off the look, if you really nail the simplified anatomy. It's much easier to just correct the sizes of the limbs though...