His philosophy of teaching was a mix of pragmatism, idealism, and populism. "Commercial illustration means pictures you can understand," he said. He also believed the work of the illustrator was the highest possible calling. In the introduction to the Famous Artists Course, he said,
"As people divided into different tribes and developed their different dialects, art became more specifically and necessarily the one universal language. It was used to record events——to tell religious stories——basically to communicate ideas to all, regardless of their own spoken language. Today art is used commercially to convey definite messages to the people."
A large collection of Dorne's illustrations can be found (and downloaded) at Leif Peng's Flickr page on Dorne.