how about a mummy head as in, "eeeeuuuuurrrgggghhhhhh, im an egyptian mummy" and what about a head that looks a bit like the locust from gears of war/gears of war 2
cyborg
Description:
Robotic on top half/right showing wires broken off and sparking(sort of)
Humanish on bottom half/left evil/demonish face with an evil grin,
overall details : open spaces with metallic items inside