I have done a lot of sketching and drawings with various pencils. In 1981 I did a book on pencil drawing for Watson Guptill publications which contained a great variety of my pencil work, some shown below.
A drawing of the Boulevard St. Germain in Paris, it's a simple sketch using only flat tones done on a textured paper.
A portrait sketch of one of our friends in Paris, also done on a textured paper. There are a great variety of papers available, it's interesting to try the different surfaces.
A very tight rendering done using a Koh-i-noor Hardtmuth Negro pencil. This Paris scene was drawn using a photograph as reference.
Another quick sketch of one of our friends in Paris. Color was added by using washes of watercolor, a nice fresh technique to explore.
Certain colored pencil brands like Stabilo and Prismalo are water soluble. Here is an example of a drawing done with water soluble pencils, after finishing the drawing I washed clear water over some areas, blending them and dissolving certain tones, a great technique to explore.
Here is the book in which contained these and many other drawings. If you are interested, you can still find used copies at Amazon.com and other internet book stores.