Typically, when I work with colored pencil, art brush, or a combination, I use a photo as a basis for my work. That is the case for all of these.
Mount Olympus from Bogachiel Pass
Mt Ellinor in Mist 1, Colored Pencil
Mt Ellinor in Mist 2, Colored Pencil
My First Bus, Colored Pencil
Ellils and Sharon, Colored Pencil
Mt Olympus from the High Divide