Process of the a typical environment painting.
First, simple washes of value with lasso tool to create shape and composition.
Second, further realizing the different elements (snow, rocks, etc.) and identifying the light source while preserving the simple shapes from the previous step. Overlay brush to create a palette.
third, enhancing the detail and light source, adding atmosphere to show foreground middleground and background. Noodle in some details with texture brushes.
added a dragon for fun :)
pushing light source to reinforce the direction of action...