For those interested in drawing, always begin slowly and pay attention to lighting. Notice in your subject the brightest lit areas and the darkest shadows and the variations between. Notice where they intermingle and the size of the areas lit or shadowed. Notice also the outlines (edges) and which way they curve, to the left or right. Also note where those outlines appear bold and conspicuous and where they are faint and disappear altogether. Finally, let your light and shadow blend without strokes and borders, appearing more like smoke. When you have taught yourself these principles of light and dark and practiced them until they are natural to you, then you will become much faster in drawing.