mural vs self-portrait

mural

noun
  • A large painting, usually drawn on a wall. 

verb
  • To create a mural. 

adj
  • Of or relating to a wall; on, or in, or against a wall. 

  • Resembling a wall; perpendicular or steep. 

self-portrait

noun
  • The bust of an artist by the artist him/herself; a portrait of the painter who painted it. 

How often have the words mural and self-portrait occurred in a corpus of books? (source: Google Ngram Viewer )