Creating a black and white drawing is important in developing your drawing skills more rapidly. This is because you don’t have to worry about color and your attention is only on the the grayscale ie. the color tones from completely black to white. This can be important to understanding tones that are critical to a good drawing.
Apart from the grayscale tones, the other important points to good drawing are the brush sizes and opacity. This drawing will teach you to master some of these important settings that enable you to develop your drawing techniques and to understand contrast which is fundamental to drawing.
This drawing of the lion will ground you with skills that will enable you to make better drawings in any subject.