The topic modella is discussed in the following articles:  use
as sample    • TITLE: painting     SECTION: Techniques and
methods  use by Rubens    • TITLE: Peter Paul Rubens (Flemish
artist)     SECTION: Return to Antwerp     ...was able to
maintain this tremendous output owing to his large studio of
assistants, apprentices, collaborators, and engravers. A major
painting would often begin as a modello—i.e., an oil sketch
painted by Rubens on a small panel, after which he would make
preparatory drawings of individual figures within the
composition. The execution of the full-scale work would often
be...