That is the beauty of a drawing.
The idea enters the mind of the artist in a fury (quickly), and the artist
puts it down on paper while s/he is inspired. Another example is Kathe
Kollwitz’s Suicide Victim, 1928. Kollwitz’s husband was a doctor
practicing in an impoverished area of Berlin, Germany. She often accompanied
him on his trips to his patients’ homes. This image clearly evidences furia
and sprezzatura. The woman’s body is incomplete, unbalanced, and
asymmetrically placed on the paper. The artist did not spend the time to add
in a background, so the body seems to float in a void. Analytic lines define
the contours of the head, eyes, nose, mouth, fingers, and rest of the body. However,
the lines in the sleeve, hand, and hair are so quickly sketched that they
neither define interior anatomical details, fabric creases nor create a
three-dimensional illusion of hills and valleys.