Drawing Techniques: a Guide
Function: Modello  
Once all the problems of design had been resolved in the preparatory studies, the artist set down the final detailed concept for his work in a finished drawing called a modello. This was not only part of the working process, but was also intended to be shown to the patron for final approval.

Thomas Blanchet. The Finding of Moses. Pierpont Morgan Library, New York

Detail studies and life studies