A few things-
1) Thank you for not making these HDR - I'm not saying that you personally would, but it seems like every other picture I see of old busted cars has been done in garish HDR
2)If it were me, I would do some curves adjustment to make the colours nicer.
3)Maybe an idea for if you ever go back - Maybe a shot really emphasizing how lonely that busted old car is out in that field.
4)Don't buy that car - someone's been messing with the odometer!