Normally, an artist will have white paper, and add lines and shading to it. He (or she) will usually start with a light sketch and gradually darken the shadows first, the mid tones next, and then the highlights and details last.
When the paper is black however, he has to think in reverse as he draws, starting with the brighter areas first, and brightening the highlights and mid tones next, and finally touching up the areas around the shadows last, and perhaps erasing sketch lines that shouldn’t be there.
While this technique is a little more challenging and requires more forethought, a dramatic image can be achieved using less pencil, paint, or whatever medium you are working in. For example:
I really enjoyed making this piece and I hope that you enjoy it too!