This could have more power...possibly crop the white sign out all together; dodge/burn the clouds for definition and emphasis; adjust that shadow on the foreground building; maybe bring out the color in the bricks a tad more. Good foundation; needs tweaking. :o)
I really think you had a great subject and a good eye for it initially. I think this shot would have done better (IMO) as a square. Try cropping it just above the white billboard and then make the height match the width and see how it looks. I think it would make a fairly powerful statement with the deep cerulean sky just above the faded out words.
I like the contrast between the blue sky and the brown building, but it might need a little clarification, I am not sure of the subject or point here...
"Take a photograph where complete words -- not just individual letters -- play a creative role in your composition." Billboard on bottom right is out of place and distracting, same with white wall on left. No idea why this sign is important creatively to the image.