Normally, when using a brush or pencil or pen, I use the three finger pencil grip, where the tool is parallel to the fingers. The line work is mostly done below the wrist.
|Customary Pencil Grip|
However, for stick materials, I grip the stick with all of the finger tips where the material is perpendicular to the fingers with easy access to the edges and side of the stick. The line work is mostly done with the arm.
|Customary Stick Grip|