At first I agreed with Omari about the "boring" part of it until my nose piked up the smell of diesel so as far as I'm concerned it's a great image as is. Keep on plowing.
Interesting. To be absolutely blunt, this is currently a pretty boring photo, though it has a lot of potential. Does the tractor run? If not, does it have moving parts that aren't painted or rusted into immobility? It seems to me that adding an element of motion (for example, the throttle cable pulling the throttle on the carburetor) would help a lot.
Alternately, I would like if the photo told some kind of story, as opposed to just saying "This is a tractor." I could imagine an old farmer perched on the vintage tractor, with his eyes closed, a relaxed, wistful expression on his face, and reminiscing of days past. Or perhaps just a hand stroking the tractor -- a child's hand would be awesome.
Anyway, you've definitely got something good here; keep shooting!