There is no main subject here and the completely washed out sky doesn't help at all either. Everything is in focus, but nothing in particular grabs your attention and the B&W conversion just adds a harsh element to it.
The composition of this photo is poor. To be blunt, there is nothing worth looking at. While you did play around with the contrast, and it helps the image along, it just does not "work" for the challenge IMO.
Work on composition. This seems to be a shot of...nothing. That is, there's no real subject here. One of Adams's hallmarks was a dark sky, yet yours is white.