The Art Renewal Center is the foremost entity for researching and vetting art schools that teach skill-based training techniques in the visual arts. For those interested in acquiring strong technical skills in the visual arts, ARC Approval™ holds more weight than college or university accreditation, where for the vast majority, technical drawing, painting, and sculpting skills are not the priority.
ARC is known for keeping the highest standards in art education, only approving those schools who teach solid, skill-based training methods, which increase visual literacy. The schools ARC endorses have instructors who have heavily trained in these methods and are able to produce high-quality works of their own, thereby having the qualifications necessary to instruct others on how to create works of art with fully rendered and accurately depicted realistic imagery.
The type of concentrated technical training the Art Renewal Center promotes was first developed in the late middle ages/early renaissance and was used as the primary form of studio art education throughout Europe and later, America. It was used all the way through the 19th century into the early 20th century before it died out almost completely with the inception of purely conceptual art.
Related article: The Atelier Approach to Art Education
Artwork above by a high school student that has received skill-based art training