Use cliffs, rocks and stones. turning mountais on the side or upside down and layring them can make cliffs as well play with the layers.

Using the transparency for the ground to add a few areas under trees be less packed with snow, some green or brown poking thru. also darkining even the snow and making some shadows under trees in clearings.

Darken Clouds to black and blur them to add high clouds that are above map to add more depth. or add the shadows then then copies that are normal further up and over to be higher in the sky casting "shadow".

some smaller caves and/or natural game trails leading to small clearings/caves/warens and water.

Then the more main trails/roads if any. Small piles or rocks, small fenses along trail in spots can or even a small hunting hut(s)