Here’s a photo from the January 14 1926 edition of the Toronto Daily Star of an artist painting a chef.
Ivan Opffer (1897-1980) was born in Denmark. He served as a camouflage artist during World War I. After the war, he lived in New York and Paris and became well-known for his portraits of writers and other prominent people. His brother, Emil Opffer, a Danish merchant seaman, was the muse and lover of poet Hart Crane.
The National Portrait Gallery website has an extensive collection of Opffer’s portraits, and the Camoupedia website has a detailed biography of him.
Toronto Old News 