Personally I'd mirror more of the parts if they'd look that similar in the end. I can only tell that there's some decals that differs from the arms for example. Perhaps you could have put that on with an alpha plane instead?
get rid of the games workshop icons, like the dark angels logo on the boots. also, i'm struggling to see how or where he'd be able to move in that armour man, the torso looks like a solid slab of metal going over the abs, for example.