A beautiful part of the world--I was over in Mars Hill a couple of times this summer and was really impressed by the views.
I'm no PP guru, but to me the first one would make a nice black and white if you cranked curves a bit and maybe put a digital grad filter on the sky to bring back the clouds. The second shot might benefit from some targeted adjustment to bring up the curve of the road--a 9:16 crop might be nice as well. Otherwise, the third might be a good candidate for the new "de-haze" functions that are being touted...wish I knew how they worked!