The Brush tool allows you to paint on any layer much like a real paintbrush. You'll also have different settings to choose from, which can help you customize it for different situations.
Size: You can use the [
or ]
keys on your keyboard to adjust the brush size or drag the slider horizontally from left to right to increase, and from right to left to decrease the size.
Flow: Flow controls the speed at which paint is laid down (much like painting with a spray paint can)
Live Draw enables you to draw on the canvas and see your sketch be rendered in real-time.