From teenage sketches to etchings of his daughter Bella, an exhibition of Freud’s drawings at the National Portrait Gallery gives a fascinating and essential insight into a painter we think we know Drawing is much more to an artist than just another medium. For a painter particularly, it’s the way they evolve ideas and find out who they are as an artist before brush even hits canvas. From Michelangelo to Picasso , we’ve come to think of drawing as the quickest way to access an artist’s thought