Beautiful composition and the atmosphere is captured well.
I realize it is a "grey" day, but having been in similar conditions a number of times, I should think the tonal values just below "neutral grey" could be a zone or two higher - not to be white-out conditions, but to give more life to the snow. The brightness of the sun will have caused the values to be lowered; bringing them back up again -without raising the values of the dark/black rock- just may help.