I have a slight problem with this one. The large gun Extivia is holding would make balance a bit awkward. But the claw suggests close combat capabilities.
It would be very difficult to fight at close combat with that weight throwing you off balance. I would suggest that the weapon be shrunk down, and moved so that it is attached to the armor at the shoulder near center, so it can retract to a storage position that maintains a good center of balance while in close combat. This would increase agility and reaction time needed in close quarters fighting.
Wow, this is quite an interesting piece you've created. I like how the colors bring out more of the detail in both the subject and the background. The various gadgets, mechanisms and weapons all appear very well-drawn and thought out. Now this is a prime example of what artist can think up and how wonderful the end result is. Excellent work overall.