Looks like you no longer need any more tips for B&W post processing, I think. Any more contrast and the foggy aspect becomes unnatural, and I take it you go for a natural, albeit black and white look? It is THIS grey (here too, all day long!), there are not many contrasts THERE these days. (We have the same weather, save the hoar frost during the day, though we have that, too, in the early mornings).
I really like the leading lines of the curving path through the depth of the photo. The tree tops also seems to compliment the curve. Had I not followed the path to its end, I may not have noticed the symmetry of the fence posts going off in opposite directions.