This is starting to look so amazing! Great work! I could see this in some sort of early-human scene.
Though there is one thing I'd point out. You have mud flows in your scene, but there are no mountains for the mud to run from down, and on-top of the glacier! :O Also, these flows, are vertical, along the length and slopes of the glacier, not horizontal. The second image, which has the most heavy debris, was from a landslide.