This step and the following include techniques for detailed pencil drawing. You can use line strokes to fill in the trees and blur with a tissue. However, to get quicker results, I used firm pastel color sticks, ranging from light, medium, to dark gray. You can literally save up to two hours or more. With a tissue, I then rubbed lightly to blend and fill in. Afterward, I sprayed the picture with a workable fixative (Krylon). The spray adheres the pastel to the paper so it will not smudge. After the fixative dries, you can work more on your picture. Notice also my penciled lines did not disappear.