Nice. The only issue I see is that the rear wheels dont have any space. You should give the rear body a work over. Maybe add some Air intakes on the door to make the Transition from door/rearbody dont look that hard. I hope you can understand me and my lousy english.
Most are using 3dsmax 7 or 8 and Brazil (or Vray) as render engine .
What are you asking next? "Where can I get these programs?" I guess.This forum is full of information, so search and read. I managed starting rendering the same way. So maybe this may help: http://en.lfsmanual.net/wiki/3D_Render_Tutorial
and Ian H's premade scenes. http://ds-autos.digiserv.net/scenes/lfs