Now that I'm looking at it AWAKE, I would say it needs more stowage. Gears, guns, ammo, track links, etc. As any IG tank should. Also, some guy at the GW website has some great downloadable icons for Mechanicus tanks.
Do you have any tubing? I think the gun would look really cool with some clear tubes running into the back of it. (Note this would make the gun immobile)