These are beautiful and moody black & whites! Well balanced, tonally and compositionally. My only nitpicking (you knew it's coming, right? ) would be with #2: gray snow. As I said in another thread, when snow is presented as gray, there should usually be a compelling (esthetic) reason for that. If you had that reason and did it deliberately, than my comment shouldn't matter. By the way, we are talking here nuances, very slight changes in tonality, not reaching blinding-white levels.