Possible Clues:

• Painting is an occupation for the worker
• Working as train mechanic, perhaps
• Skilled worker's time is invested in area managed
• Seems that Arthur is an operative
• Skill is an essential in his job
• The craftsman trains a replacement
• Rising artist isn't a bad craftsman
• Drawing is an activity for such a worker
• Train as working craftsman
• How the artist turns to a confused saint for a trade