|"Winter Aspen Study 1"|
|"Winter Aspen Study 2"|
|"Winter Aspen Study 3"|
In the second study, there is light coming from the right as indicated by the warm glow in the sky and on the snow. The focal point of the painting is the large aspen in the foreground so you see more definition. Distance is indicated by each of the other trees being less defined and smaller than the focal point tree.
In the third study, there are more indications of distance. The line or path in the snow takes the eye back into the depths of the scene. As you travel you notice the trees becoming less defined and smaller and finally the mountains are faded and vaguely depicted. The shadows indicate the direction of the light and the variations in the terrain.