A fan brush is a brush with a thin layer of bristles spread out by the ferrule. A fan brush is commonly used to blend colors, but is also perfect for painting hair, grasses, or thin branches. (Though you need to be careful not to make identical or repetitive marks that look unnatural.)
Possible uses a fan brush include:
Stippling (spread out small dots or short dashes).
Highlights in hair as it helps produce the illusion of individual hairs.
Smoothing and blending out brush strokes.
Painting a tree or grass
See Also: How to Paint with a Fan Brush
Buy Direct: Fan Brush