I think you did a nice job considering the close proximity of the surrounding environment. For me #3 is the best, I like the 928 as well even though the balloons and background fence kind of detract from the car along.
Mike,
I think you did a fantastic job on these. And the overcast lighting, in my opinion, helps the overall look of the images. The colors pop, and your choice of locations to shoot from keeps them interesting. Nice!