The Heatherley’s school of fine art:

http://www.heatherleys.org

The Florence Academy of Art:
http://www.florenceacademyofart.com

The Barcelona Academy of Art:
http://www.florenceacademyofart.com

The Royal Drawing School:
http://royaldrawingschool.org

Short l’Ecole Nationale des Beaux Arts de Paris:
http://www.beauxartsparis.com/fr/formation/cours-pour-adultes