Brush techniques refer to the various methods artists use to apply paint or other mediums to a surface. These techniques can create different textures, effects, and styles in artwork. Common brush techniques include dry brushing, where a dry brush is used to create a scratchy texture, and wet-on-wet, where wet paint is applied onto wet paint for smooth blending. Additionally, artists may use stippling, which involves applying small dots of color to build up an image, or scumbling, where a dry brush is used to apply a thin layer of paint over a dry layer. Each technique allows for unique expressions and can significantly impact the final appearance of a piece.