The problem with this image for is that the subject is not clear, is it about the guy on the bench, the building or the sky. I think you would have had a much stronger image if you had concentrated on the subject that interested you and composed for that rather than the wide shot you have. You may be able to improve it slightly by re-cropping it to change the emphasis of the subject. Whatever was your chosen subject I think it would have looked better with a viewpoint that didn't include the white van. I do like the B&W conversion though and you have managed the building highlights well.