A couple years ago I was fortunate to do a pastel workshop with Margaret Evans in New York City with the Pastel Society of America. I chose to do this forest scene since I was immediately drawn to the back light falling through the trees.
Back lit scenes are great subjects especially in the fall season where sunlight catches the backside of orange and yellow leaves. The illusion of depth can be seen here and was achieved by darkening the trees and foreground, against the light values of the background.
Pointing the shadows away from the light source creates perspective and leads the eye towards the light.
I used Great American Pastels and worked on Colorfix sanded paper.