First, I'd like to direct you over to X-Convict's gallery. He's a member here, and posts some fantastic looking cars as well as information on rendering them. http://www.artemstudios.com/2010/gallery.htm The first thing to look at is his wire frames to see how and where details are placed. Of course, his designs are more…
There are some incredible things that can be done with just wooden boxes and crates. I agree with Drav, the modeling is distracting from the impression of the textures, so if you want to improve on textures, I would go with something simple where the texture really makes the model sing. This is just an example I found from…