Sketch

English: Sketch is a rapidly executed freehand drawing that is not intended as a finished work, often consisting of a multitude of overlapping lines.

Various sketches

• 
  Drawings of a bird in flight, Leonardo da Vinci.
• 
  Sketches of a lion 1980 pen and china ink on paper by Frans Koppelaar.
• 
  Software generated sketch
• 
• 
• 
• 

Sketches compared to finished artwork

Detailed sketch and finished woodcut of Albrecht Dürer's Ritter, Tod und Teufel 1513.

Winslow Homer - The Life Line (1884).

Jean-Auguste-Dominique Ingres - Madame Moitessier (1851).