Try flipping your image horizontally.
You'll see that the forms are way off in scale/shape. This technique works wonders in helping your eye to see things that are too big or small as well as awkward shapes and lines. The helmet and legs of the suit look much MUCH too large for your skinny guy.
Additionally, you should try a little more hue-shifting -- the colors are still a bit boring on the left robot.
Btw, definitely recognizable as Bubblegum Crisis though! Good job on that at least.
