draftsmanship vs work of art

draftsmanship

noun
  • the art or craft of a draftsman 

  • the skill of drawing 

work of art

noun
  • A product of the fine arts; a painting, sculpture, etc. 

  • Anything beautiful or exquisite. 

How often have the words draftsmanship and work of art occurred in a corpus of books? (source: Google Ngram Viewer )