Contrasting mechs or bots

About this artwork

I went back to doing some random robot or mech drawing. These two are meant to contrast proportion and shape styling. The one on he left was drawn first and kind of not liked. The one on the right was a try at an action pose, longer limbs, and boxy styling. It also has back mounted weapons that are on an inner sided attachment rather than an outward attachment like in Armored Core series. Also, the one on the right clearly has legs inspired by Halo 4's Mantis, except able to jump like in it's original concept.