In the "Welcome" thread I said to post photos and now I see you already have.
These are good. The one I like most is the second, which elicits a feeling of abandonment from that car - it almost seems like a portrait in a way. The one of the tractor is not as good because the lighting is uninteresting and there's a little too much in the foreground. Back to the second, the only thing I might change if this were mine is to crop just a bit on the right to eliminate the bright spot on the hood that is on the edge of the frame and maybe part of that other bright spot on the corner of the roof. If you wanted to maintain the square crop, which seems to work for this, you could shave just a bit off the top and the bottom.
The last one works well as a square crop also - nice color contrast between the blue and the yellow.