The jet like robot is based off of my "Star Suit" mech. It is a little old, but is one of my best. (please check out the star suits in my deviantart gallery.)
The Tank type robot is based off of "Heavy assault armor" and was originally planned to be carrying a chain gun, but I got impatient. He still has that large rocket shooting pistol though. (He is also in my deviantart gallery with other images.)
The Tank robot's head is blurry from the crappy scanner, but I think the Jet robot looks good enough to fit in the art portal.