Okay,
You don't have to put your stamp on your texture map, if it isn't complete, whats not, people don't steal texture maps nowdays anyway, so it isn't necessary. Sort of makes it annoying and difficult to look at.
Model: It does look pretty simple, not much geometry to make it look too interesting. Still its a good start.
So what I can tell from the UV, is that you have alot of unused space. The black areas of the UV need to have been filled in with the rest of the faces that have been uv'ed. Scale everything up a bit, and have a go at a bit of UVpacking or what I call tetris
and try to fit everything in nice and close and fill up the whole texture map. The tyres could have been overlapped, and maybe a few other areas as well.
Texture: For the green it looks as if it just a solid with a grunge brush gone over it. I feel that you could add some white scratches, setting the mode to overlay and using a 1px brush start scratching it up on the sides or areas that it would make contact with other objects to get it scratched. It could also use some interesting things like indents painted in, or buttons or a grill or something to break it up from the plain feeling. Have a look at some refs and see how they work. They probably have some screws as well running along the sides.
Render: Don't render on a black background, it makes it hard to see in contrast. Possibly do it on a gray or a dark gray.
Can't really see the wire, as ss said, so just take a screen shot with edged faces on so we can see it better, or just take a viewport screeny.
Good stuff so far, keep it up!
