on nicolaides book if i remember he says look at the model and drawing it as if you were looking at it in a 90 degree angle (as if you were sitting in the place of someone else.) i guess to develop the sense of form in 3d...has anyone tried this?..seems like a very difficult thing..also giving your back to the model..turn around see as long as you want then turn around again (without facing the model and draw it..to develop a sense of visual memory...
i like nicolaides book, it focuses more in the abstract aspect of art..the feelings..is not a book on technique .