It looks pretty good, though it looks like the model itself could use a little TLC.... It looks as if it's been rear ended!... No offense.
As for tips on improving your Renders...... well first we gotta know what sort of a set up you are using.
what type of lighting, and textures, and all that stuff.
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!!"