Nice!
The Geo is nice and clean. I think you need to make his head slightly broader though, at least that's what i get from looking at your drawing, although it could just be the perspective.
nice work!
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"Your weapons are no match for ours! People of Mars, surrender!"
"Um, this isn't Mars. This is Earth."
"Earth? Earth-with-nuclear-weapons Earth?"
"Yes."
[long pause] "Friend!!"