Drawing freely and directly with a brush helps to liberate your technique. Opaque paints are not suitable as the marks and lines must be fluid (flowing easily from brush to paper). Light pressure is applied to the tip of the brush to give a precise delicate line. A little more pressure and the line will become thicker. Hence, it is possible to draw a line that is both thick and dark in places, then very fine in others. It is particularly useful to create movement in figures, animals or even landscapes.