Frosted mylar (e.g., Duralene) is an excellent surface for drawing in ink. The plastic sheets are durable and transparent. You can trace over a preliminary drawing or even a photocopy of an object. You can also scratch away highlights or details with a scratchboard cutting tool. Be careful not to get your fingerprints onto the drawing surface as the oil from your fingers may cause the ink to bead up.
Here are some examples of leaves traced from photocopies of real leaves. Notice how easy it is to follow the nuance of the variation in leaf venation. Also note how line thickness is used in these drawings. Instead of using thicker lines to indicate objects that are closer to you, I use a thick line around the outside contour of the leaf and lighter lines on the veins. This is an effective graphic style- heavy lines on the major structures, lighter lines on the details. It is often used in technical drawings and architectural diagrams producing clear and readable images. Click on the first image to start the slideshow.
Lets take a look at the process of making one of these drawings on mylar film. Click on the first image to start a step by step annotated slideshow.