: The preceding images are not from Michelangelo and His  Drawings from Windsor Castle (online reproduction of art in the National Gallery exhibition is forbidden).
The images are not by Michelangelo or Da Vinci. 
mnli hypothesis: The images are not by Michelangelo or Da Vinci.  premise: : The preceding images are not from Michelangelo and His  Drawings from Windsor Castle (online reproduction of art in the National Gallery exhibition is forbidden).