There are three kinds of brushes available to use for drawing.
This is the default brush. This brush creates smooth lines and can be used as a basic brush for doodling and sketching purposes. You can also write with this brush.
This brush creates circles in different sizes and opacities, making it perfect to give an ‘ink splatter’ effect to designs, among other uses. Note that you can change the drag speed of the brush to vary the opacity of the circles and the distance between them.
This brush replicates a dispersed spray-paint effect. It’s a great way to add some extra texture to the background of your designs. Use this brush in bright colors to liven up a design.
Here’s an overview of how to use the draw feature.