this method

Learning to Draw by making it easier for the right brain and harder for the left brain Marvin Bartel, Ed.D. © 2003 For a related essay see: Motivating Non Drawers See a page on teaching Shading Other Art Ed Links by this author  Author's artwork

If you are new to the split brain theory, you will find a good explanation in Drawing on the Right Side of the Brain by Betty Edwards.  Most libraries have it or you can order a copy.
TEACHER TECHNIQUES TO MAKE IT Easy FOR THE RIGHT BRAIN

1. Make it easy by starting the drawing of a SINGLE ORIGINAL LINE THAT DOES NOT CONNECT TO DEFINE A SHAPE.  Try a piece of wire that is bent in a way so it stands up on the table in front of the student.  Make a variety of intervals between the kinks and bends.  Every segment is different.  Avoid any subject matter (do not give the left brain a chance to summarize or generalize it).  It can be fun for students to make these abstract wire "sculptures" for each other to draw. This way they learn to make challenging ones for their own independent practice at home.
   
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2. Make it easy by limiting this to a short time.  I use no more than five or ten minutes at the start of every period for this kind of practice, but do it before every art lesson or every day so it becomes habitual like a SHORT PRACTICE RITUAL or "warm up drill" for art class.
   
   
3. Make it easy by asking students to FIRST DRAW IT IN THE AIR while looking directly at it - not drawing on the paper. Let them follow the wire or edge very slowly in one direction and practice in the air again in the other direction.  Watch that they move slowly and watch that they see the kinks and bends as they go.
   
   
4. As the teacher, make it easy by going over to the object and move along the edge with your YOUR FINGER.  SLOWLY follow the line to show the deliberate slowness you need in order to see every part.
   
   
5. Make it easy by NOT DOING A TEACHER DRAWING and not doing a demo.  The left brain tries to memorize a teacher's drawing.  It has learned to mimic the teacher in order to please the teacher.  The student's own drawings are inferior and discouraging.  Seeing an expert drawing discourages the fragile right brain.  The left brain likes teacher demonstrations to provide answers and patterns to follow.  Teachers can stop demonstrating if they start using hands-on preliminary practice sessions to clarify working methods.

• Select observable subjects that the person has NEVER SEEN (the left brain is like a giant hard drive full of on-demand images).  When the student tries to draw a nose, it says, "Here is a face. Use this. Don't get frustrated trying to see the shape of somebody's actual face."  This is why it is easier if familiar things like stuffed toys and shoes are placed upside down for observation drawing.  A teacher can bend a piece of wire in an interesting abstract way.  It will be a new thing to see.  Dried weed pods, interesting branches, random droppings of sticks, and so on are things that are unfamiliar to the left brain.

Place a BLINDER on the pencil.  A blinder is a huge card like a file folder with a hole in the middle.  Place it on the drawing pencil above the drawing hand.  When the left brain is tries to create its thing on the paper it wants to see the paper in order to make sure you are following its pattern.  Of course it can draw familiar stuff without looking at either the paper or the objects, so the blinder works best when combined with things for which no previous simple image (schema) (pattern) is stored in the brain.

• Be sure students are sitting so they are NOT TEMPTED TO COPY another student's drawing.  Copy work is a favorite way for the left brain to acquire those cliché ways and retard the right brain's development.  "How to Draw" books have the same numbing effect on the brain.
  
  
• Do not require sessions that are too lengthy (especially at first).  Honest right brain work is hard work and fatigue can interfere with serious effort.  Try it.  You will see that you can feel a slight head pain if you really work to observe a new thing and draw it without looking at the paper.
  
  
• If you select things that the left brain has memorized, INVERT the object so students  see it upside down and draw it that way.  The left brain will be frustrated and allow the right brain to attend to the observation.
  
  
• When drawing a shape such as the edge of a leaf, an inverted shoe, or a person, warn students not to expect the beginning and end of the outline line to match on the paper, but simply expect the line itself to have the look of the actual edges.  I allow them to "fix" the meeting point with an eraser if it bothers them.

Conclusion
Philosophy of teaching - MAKE THE HARD STUFF EASIER, AND THE EASY STUFF HARDER.  "Reduce frustrations and increase challenges." 
MAKE THE WRONG WAY HARDER AND THE RIGHT WAY EASIER.
When assigning drawing from observation, we do things to make it harder for the left brain and easier for the right brain. 

Some short practice ideas

Here is a web site with examples posted in Japan.  It has lots of images.  Please give it time to load.

This page shows observation drawing outings and  sketches from Ukita Elementary, grades 1 to 6.