Run a teaching workshop, and charge for it
The Antwerp guild registered thirty-three apprentices with him between 1587 and 1627, and the training was not cheap: in 1598 a former pupil still owed him 115 guilders for board and lessons.
Why it matters · A master craftsman of the time earned less than a guilder a day, so 115 guilders was a serious investment in a place inside a working shop. That is what an apprenticeship bought: years of living with the trade, at the master's table, before anyone called you a painter.
Max Rooses, Rubens (1904), on the guild register; Nils Büttner, Antwerpener Maler, on Matthijs Willenhout's debt of 1598
Teach the rudiments, not a house style
Was remembered as a first master for beginners. Max Rooses called him "un bon maître primaire," skilled at teaching the rudiments of the trade and well liked by the young.
Why it matters · His two famous pupils went in different directions. Rubens moved on to Otto van Veen and Italy; Jordaens, who had no other master, built his whole career in Antwerp. A first teacher who installs the foundations without stamping his manner on a student leaves room for that.
Max Rooses, Jordaens, sa vie et ses oeuvres, 1906
Draw for the engravers
Made designs that Antwerp engravers cut in copper, among them a Life of Saint Catherine in thirty-two small plates engraved by Adriaen Collaert, a Five Senses and an Orpheus, and small illustrations for the Plantin press.
Why it matters · Print design paid, and it carried a painter's compositions far past his own walls. It also survives where panels perish: for van Noort, the engravings are a large part of what can still be seen of his invention.
Max Rooses, Rubens, 1904, listing the engravings after his designs
Be known for the figure
Built his reputation on figures. Karel van Mander, listing the painters of Antwerp in 1604, called him "oock fraey van Figueren," also fine at figures, and Sandrart in 1675 remembered him for his large figures.
Why it matters · The figure was the core skill a history painter's shop had to teach, and both of his famous pupils became figure painters first and last.
Karel van Mander, Het Schilder-boeck, 1604, fol. 295v; Joachim von Sandrart (1675) as cited by Rooses, 1904