This YouTube interview is fascinating.
Really an amazingly talented guy. I found this interview and comicly David Clayton is compared to the Archbishop Lefebrve of the art world! I found this coloring book about Angels illustrated by David Clayton and to order go here.
The art school founded by David Clayton is called the Ressource school of art and it is described here:
Traditional skills taught with rigour and discipline: naturalistic drawing in the academic method as used by the Old Masters; traditional principles of compositional design and sacred geometry; Byzantine iconography. Site contains information on teachers, the programs, and traveling tours. (Oxford, England UK)