Here are some examples of using selective hillshading styles based on a Glaciers masking layer. Glacial hillshade is icy and non-glacial hillshade is earthy. Here’s a how-to.
Southern Andes…
Southern Greenland…
Alaska Range…
Alps…
Caucasus…
Western Himalayas…
Here’s a shoddy video if you are inclined to give it a go…