white on grey isn't colourful enough to distinguish this from just a straight B/W (I know JD tractors are green so there may be a slight joke here but it's a bit obscure)
City folks might not get this one. I would have either centered the crop so the radiator wasn't off to the left or just removed it and done a tight crop on the name. Either case - the rest of the tractor has a funny off purple hue that really needed to be greyscaled.
Looks like the paint is purple. Aren't these green? You should have left it green and desaturated so it's a very very light green. I'd have cropped it so just the top half of the image is showing. I there's too much of the grill there. Maybe so that just the first 2 grill supports are showing. This would also emphasize "John Deere" more because it would be bigger.