I don't really see this as low-key and I think the crop is a little jarring. You certainly tried to take a difficult photo and make it fit in the challenge, but I think maybe an entirely different approach would have worked better. On a side note, I would like to see the original of this, the colors are very nice.
Just comes off to me as a shot that has been darkened a bit. I like semi abstract views of cars, but aside from the challenge topic, this just is not impacting me much, I'm afraid.