Those pointy cones are bringing the mech's quality down. Personally, I'm not fond of sword hands. I'm into samurais & ninjas as well so I think you get more control by carrying a sword with your bare hands. But that's just me! BFGs on the shoulder are awesome. Don't look like they can pivot though. Does it fire in projectile motion? I was assuming they fire straight. If so, I guess it's for something flying above? The cones, boosters and sword hand look like they're added by somebody else. Maybe you rushed it towards the end?
I like the way you draw metal and metal texture. Lighting is perfect on those metal plates! Blue glows here and there are a plus. I like your mech's head style. Action blur added depth into this pic. I like it overall. I wish I can draw mechs like you! Maybe you should make tutorials!