"Imperfections/dirt" in realistic animation

-depends on anim style; only works on realistic -only add dirt AFTER base animation is done, at polish stage -ensure visibility on camera; more camera movement may require more dirt -certain actions do not have perfect arcs and may have linear spacing -eg. of dirts : breathing,knee/elbow wobble from impact -try not to replicate real life,extract essence of movement/idea to communicate visuals clearer -do not overdo

source&image credits:

http://spungella.blogspot.com/2009/08/dirt-controlled-sloppiness.html http://fliponline.blogspot.com/2010/06/perfect-imperfection.html