Trying to address weak points and working on improving my environment visual library.
A couple tips when doing these types of rocks:
-always design asymmetrical shapes keeping Big, Medium and Small in mind (variety)
-roughly horizontal and vertical cracks crossing each other
-when doing cracks be sure to vary their depth and break up the smaller ones
-deep cracks become overhangs that cast shadows and create deeper occlusion
-hue and color changes + big indented diagonal 'scars'
-moss and a texture of tiny circles
-to create more depth, add horizontal surfaces that catch the snow and light
I also posted a quick little process of a snowy rock with a few tips
Thank you, hope that was useful!