An exhibition on Florentine artist Agnolo Bronzino (1503-72) at New York’s Metropolitan Museum of Art serves up almost 60 pieces by this master draftsman ranging from doodles and rough sketches to dazzling figures and portraits -- all serving the function of practice for a separate finished work. Among these is the magnificent “Joseph With Jacob and His Brothers,” arranged so organically that the eye feels compelled to rove ceaselessly around the small sheet...