That mech looks amazing, that green color on him especially. It reminds me of the Transformers, tbh. I really love how the paper isn't completely white, it's got a rather dirty background -- which I think is very nice, especially considering this kind of drawing style, which is fantastic!
And it was then that Killbot 5000 realized that it could never hug the bright and cheerful pony that looked upon it not with fear and hatred, but with delight and appreciation, for such an action with its arms of blades and guns would only bring severe injury and even death to the small creature. A profound sense of sadness suffused its AI, and once again it silently cursed its human creators, who still managed to torment it even after it had hunted down the last of their kind into extinction, depriving it of any chance at happiness and fulfillment outside of pure, ruthless destruction.