I know this piece is already 'done', and it looks absolutely superb as is, but I think it would be great if the robot were to interact with the planet, or even the people on it.
Perhaps the robot could be connected to the planet, and sprouting robotic tentacles through certain places, and terrorizing/killing off the inhabitants of the planet, who may or may not be fighting back.
Just an idea.
Again, I think it's great, but there's potential for so much more.