What you'll need is a light colored rock, ping-pong ball or something that is light in color and round in shape so you can get some shadows. A piece of copy paper and a 2B pencil.
Now place your object on a table where there is some strong, directional light. You can use a single lamp or window as your light source. Adjust your light as needed so that your highlights and shadows are clear. Do you see how the light source is casting shadows on your object. Look at the shadows, highlights and the reflected light that is bouncing back from the table. You may not have any reflective light if your table is dark. Observe the diagram to the right. You may even use this if you can not find an appropriate object. Notice the shapes that the shadows and highlights create. Very lightly sketch the outline of the object and the shapes that are created by the shadows and highlights.
Let's start with the darkest shadow first. Without lifting you pencil, use a continues back and forth shading technique to cover the area. So as not to create just a solid band of stokes on your paper, vary your stroke lengths and as you're going back and forth, use a rounding motion at each end.
Continue shading the reflective light and other highlights with lighter stokes, but remember to use directional lines or curve your stokes so that it appears as if the shadows are wrapping around your object.
To give your overall object some texture, try an overhanded grip and shade very, very lightly with the side of your pencil.
Finally, use a kneadable eraser in a dabbing motion to lift out, rather than rub, the graphite where you've applied to much pencil and to re-work some lighter areas.
Remember to draw what you see!
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