These are screen shots from my demo reel of my tractor.
I was going for just modeling. I probably would have textured it if I had time to do so. But I didn't so I just put some quick shaders on it
Feel free to comment as you like.
Though if you don't like, at least have a reason that's helpful to me to be better.

I used Maya 8.5 for this.

If you want a bigger picture to look at go here
http://fc04.deviantart.com/fs24/f/2007/316/f/9/Tractor_mini_excavator_by_CleverFoxImages.jpg