Some old pencil drawings

A sketch of a convergent lady beetle I did:

Sugar maple leaves drawn with carbon dust on drafting film. This was my first time working with drafting film and carbon dust. I quickly learned that fingerprints on film are a bad thing! However, it did end up creating some interesting texture effects. After completing this drawing, I ruined the whole thing by trying to backpaint it.
I took an adult continuing ed drawing class, and one night we had to draw a wine glass still life set-up. We covered the entire piece of paper with carbon dust, and then completed the drawing by adding darker values, or erasing to create lighter values.