This old Allis-Chalmers has a lot of charm and is a good subject for this challenge. There are a few technical things about this image that are going to hurt your score. First, the b&w conversion is not very well done. There are not a whole lot of gray tones in this image, which is causing the tractor to get lost in the background. You might want to check out the tutorial section, as fotomann has written a very nice piece on b&w conversions. Second, the straight on angle you used to capture this image is not very interesting and give the picture a snapshot like appearance. Thirdly, the image could use a little bit of sharpening to help the details of the tractor to pop out more.
Lacks contrast and composition. I think the B&W loses here too. THese old tractors all had unique paint colors to them (think 'John Deere green). This one should have a nice red color that I would have liked to have seen.