Very tight! You're getting better every time, and you're also beginning to understand how cel shading works on matte and glossy surfaces.
However, I will suggest that you start learning how to use discontinuous (broken) lines to denote rounded and/or highlighted edges. This will greatly enhance the lighting and edge variety on the mech, even without cel shading.
One minor nitpick: the area around the head, particularly the neck, isn't filled in completely; this makes it appear as if the head is just "floating" on top instead of being solidly connected to the torso.