He drew convincingly as Andrea Mantegna and Nicolas Poussin, Giovanni Battista Piranesi and Peter Paul Rubens, Thomas Gainsborough and Jean-Baptiste-Camille Corot.
The two Titian paintings form part of the Duke of Sutherland's Bridgewater Collection - featuring works by Raphael, Rembrandt and Poussin - which has been on loan to the National Galleries of Scotland since 1945.