Having read the book ‘Drawing on the Right Side of the Brain’ by Betty Edwards, I tried one of her set exercises. This involved reproducing the famous Picasso drawing of Igor Stravinsky. The image you copy is upside down and you draw your copy upside down, and don’t turn it around until you finish. This encourages you to see shapes and lines instead of interpreting these shapes as objects ie. face, hands etc.
Here is my result after 20 minutes (hand drawn sketch on paper)
Here is the original by Picasso.