He's gonna have a hard time operating those controls on his left arm. (Imagine your own arm on the far side of an assault rifle's pistol grip.)

Great art, though; your rendering style echoes of Shusei Nagaoka, but your composition is much more dynamic.

I don't know how this particular 40K world works, but it might be more grounding to "dirty things up" a bit. Make them look used...and abused.

That said, I'm more partial to gear that look shiny and new.

