Nice.
I like how you've managed to achieve a sense of scale in the Zbrush render. Once all th little details like trees go in, it should look great.
www.stevenegan-cgi.com
"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!!"