I drew this using only two types of pencils and a stubby, an H2 for the clouds and some mountian shading and an H9 for the darker moutian shading and created a two toned image which contrasts well. It is simple, but I liked it.
Below is a new drawing I drew the other night. I photographed it and then used photo editing software to make a high contrast version, which better represents the contrasts as they appear on paper (as the unedited version fails to truly capture the contrasts). I included both as an example of the difference.