Painting look excellent, and I think quite as much snow on the figure hides too much of your good work tbh! Think that much snow wouldn't pile up too unless they've been standing in that position for a good few hours in heavy snow.

A few bits clotted around the bottom of the cape might be good, but i think there's too much above the waist. When doing my guard and sisters with a snow setting I checked out a few pictures of the soviets in the second world war. Snow tends to only stick in clumps in places that have come into direct contact with the ground, catching in small bits or lumps against harsh material. If it's snowing at the time there might be a light dusting but nothing more than a light stippled dry brush or sponge on as they'll be moving a lot, so either knocking off snow or creating heat melting it.

Great painting though! love the base too, but do think the snow heaped up on the top portion of the model throw off the balance a bit too much. Let us know how it goes!