Man, I knew this HAD to be one of your bots, nice work dude.
Yeah....the spear is the beggest problem. I put a outline there but it looked to jarring and so i just left it with the aa. Kinda was to tired to fix it but i do it now.
The broken outlines and dark AA on the spear look like they should be shown on a dark background, not a light one. They look rather messy against this one.
The outlines on the spear/cloth don't mesh well with the background as someone else said. It would look better imo if it was just a solid outline like you did on most of the robot, instead of broken up towards the end. Maybe if you use one of the darker colours that you used on the robot for the background, it won't be as jarring as you said?