Interesting Idea. I might have closed the driver door and tood the person sitting behind the wheel to take his fingers out of their mouth. =o) (Assuming this is a set up shot not a candid shot)
Aside from that... The flare on the windshild is an abvious distraction. I might have tried to get more creative with the angle. Another thing to think about is the DoF. A shorter Depth of Focus would have reduced the attention of the background. Points for originallity.
I don't like the glare on the windshield. Maybe you could have gotten down to the sprayer things and filled the frame w/ the spray coming out of the holes. There's just too much going on in the picture. Clever idea though!