The gestures of painting

Further to the previous post where we were looking at the input devices and how this would fit into the gestures used by painters, below are some demonstrations - albeit a bit exaggerated... but it would seem as though, there may be just as much movement in the arm and wrist as there is in the fingers.
If the painter is doing incredibly fine work - the wrist and arm are quite still, sometimes they would even need to rest on a surface.  Whereas canvas work and more open gestures involves movement by fingers, arms and the wrist.   Perhaps the input device need just be on the wrist...