Could be just my monitor, but the last two images look dark - blocked up shadows.
There is a bit of snow showing through the trees near the center of the second image that I would clone out. I keep wanting to look at it to see what it might be, and then discover it is nothing.
Yosemite at Midnight looks very much like daylight, except the star trails. For a night shot, I would have reduced the exposure to look more like midnight.