Cloudy days stink for landscape challenges :) I had this same issue. I feel like its a little on the soft side. I think it would have also been better for me if it wasn't a centered composition.
The silo is too centered, the B&W conversion is too flat/muddy, and the photo is slightly blurry. I sure don't mean to sound harsh, so I apologize in advance if I offend. Good effort, especially since I didn't enter anything in the challenge...