Using scribble art both as hobby and non-art pedagogical skill if you are teacher or illustrator

Scribble art can be used both for creativity reasonable sketch art pieces, converting print outs of photos into artwork, shading of portrait drawing, shading of tracing picture along with improving your pencil or writing utensil like micron sketch pen grasps of kids.

It has been recommended that one can begin the scribble-sketching art by creating portraits of animal and human faces by consciously manipulating the scribbling to create effects.

In scribble artwork, overlapping and spreading writing movements of flowing alphabet shapes and other irregular bur repeated shape-forms can be used but with a varying tonal effect. First scribble the whole portrait scantly then decide about the parts and areas for different tonal scales. Get going and practice train your hand by making a scribbling tonal scale with two times to six times overlapping'

BROAD PROCESS

-Clamp together the tracing paper and portrait pictures to make sure paper does not move.
-Draw the out-line
-Draw the main features and contours
-Mark few portions of light and shade on the face. 
-For dark shades, scribbles tightly and for light areas space out the scribbling 
-Keep scribbling until you complete the filling up of the whole picture outline
-Look at the sketch from a distance and make scribbling adjustments, if desired
-Compare with actual picture to make any further adjustments, if needed

It has been found that such work leads to enhancement of visual intelligence, cordination skills and improve cognition sice most of us are visual learners.