From left to right: Height, Normal, Albedo, Roughness, Ambient Occlusion, Emissive.

Here I started creating the main large wave shapes of the Ice.

In this area I started making the medium sized "scoops" that seem to cut into the glacier.

Here I added smaller scooped areas for variety.

I added some horizontal cuts from wind or erosion on the ice as well.

This is a mask I used for the light blue lines along the texture.

All my nodes for color variation.

My entire graph