I'd love to see the shadows lifted a bit, just so we could see a tiny bit more of the cars and their roofs. It's a pretty dramatic image, and I know the underexposed areas are dark, but just a tiny bit more information in the shadows would really pump this image up. A very minor horizon rotation like 1 degree clockwise would make the horizon read a bit better.
I think you could also crop off a little bit on the left hand side and also a bit off the bottom of the frame, to make the Wal Mart sign a bit bigger in the final image.
It's a pretty interesting shot of just a sign and some cars and trees in silhouette. I bet you got it for a good,low price too,eh?