Using hair in Autodesk SketchBook is a great way to add texture and depth to a drawing. To get started, you'll need a brush that works best for creating hair. Look for something rough and scatter-like, such as the Acrylic Fuzz brush. You can experiment with different kinds of brushes to see what you like best.
Once you have a brush to work with, begin by making short, angled strokes along the desired shape of the hair. For example, if you want the hair to be laying flat, then you need to make small, angled strokes that are all going in the same direction. This will ensure the realistic texture and direction of the hair.
Afterward, you can use a blender tool such as the Smudge Stick to soften and blend the strokes together. To make the hair look more realistic, use an erasing tool to pick out sections of the hair and fade out certain areas.
And finally, you can use the color palette to finish up the hair and make it look realistic. Don't be afraid to mix colors and experiment with different kinds of values and shades.
With a little bit of practice, you'll be able to create realistic hair in Autodesk SketchBook!