Looks like a good start,
The edges loops around the eyes seem.... weired! Maybe you could re-work them?
Not much more to add.... as this is the base mesh, and the project really begins when you start sculpting. 
Good luck!
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!!"