Preparing the Drawing Tool
Three main tools are used for hair touchups: the [G-pen] sub tool of the [Pen] tool, the [Opaque watercolor] sub tool of the [Brush] tool and the [Soft] sub tool of the [Airbrush] tool. Change the [Brush Size] setting as needed while drawing.
Use the [Soft] sub tool of the [Airbrush] tool to apply a smooth gradient in some areas. Set a large brush size, as you will be blurring a large area.
Use the [G-pen] sub tool of the [Pen] tool to create a sharp division between two colors. Set a slightly large brush size as you will be coloring.
The [Opaque watercolor] sub tool of the [Brush] tool creates a comparatively clear division between colors, but gives a softer impression than the [Pen] tool as you can vary the darkness of the color according to the pen pressure and mix the painting color with the ground color. Mixing the colors creates uneven color distribution, allowing you to intentionally leave brush strokes.