To accurately answer your question, I would need more information about the drawing you are referring to. However, I can suggest some common natural resources that are often used in drawing:
- Charcoal - Made from burned wood; used for sketching and shading.
- Graphite - Found in pencils; used for drawing and writing.
- Colored Pencils - Often made with pigments combined with a binder.
- Natural Dyes or Pigments - Derived from plants, minerals, or other organic sources.
- Ink - Can be made from various natural materials, including carbon black or other dyes.
If you provide more details about the drawing, I could give a more specific answer!