A 2 mm leads such as the ones encased in wood, or wooden pencils, shouldn't be used for its sharpness, there is the smaller lead sized mechanical pencil for that. What wooden pencils have over small 0.3-0.5 mechanical pencils is its broadness, which means you can cover larger areas in smaller amount of time. Instead of shading in lines, you can create smooth particle texture that gives the impression of form. if you press heavy enough with 2mm lead, you can get broader line shadings like the ones with thinner mechanical lead, except the lines are broader.
Mechanical pencils are often associated with lead sizes that are 0.9 or smaller, but there exists also 2 mm mechanical pencils, the size of the leads found in wooden pencils. They have all of the benefits of a wooden pencil and a mechanical pencil. Also, there is a rotary sharpener they make for 2mm mechanical pencils:
http://www.dickblick.com/products/st...-lead-pointer/
Don't let the low reviews discourage you from buying a rotary sharpener. If you read the reviews, most of the negative ones are from people who can't figure out how to use the simple device. You put the pencil in the only hole and you rotate with your arm, but not twist as with ordinary sharpeners.
The key thing shading with lead is to have a consistency of particle spacing(graphite particles) or lines, which takes practice. It usually takes some kneaded eraser dabs here and there to keep the consistency of graphite particles. But first you need to understand light and form.
I tried using only the broad side of a 2B 2mm pencil below: As you can see, it offers a variety of texture. You can hatch with the broad side, to get the stylistic lines shading(such as the bottom part of the dress), and at the same time have the paper's tooth catch just small amounts of particles, evenly spaced, when you shade light enough, and have no lines at all. On the other hand, an example of uneven particle accumulation is in the neck area of the picture, where you can see some dark dots caused by uneven tooth of paper. Lastly, apart from pressing the pencil extra hard, in order to get things totally dark with the limited darkness of a lead, you need to go over the same areas until the white spots or "white lines" (negative white areas caused by line shading) are gone, which was how I managed to get the dress so dark.
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