Here are 47 masterpieces of the art of portrait drawing, selected from the work of an elite group of artists who represent the great schools and traditions of Italy and northern Europe from the 15th to the 19th centuries. Among the artists are Andrea Mantegna, Filippino Lippi, Raphael, D rer, Andrea del Sarto, Titian, Pontormo, Lucas van Leyden, Holbein, Rubens, Hals, Bernini, Van Dyck, Rembrandt, Hyacinthe Rigaud, Watteau, and Ingres. In these...