 The Bertin portrait has been hugely influential . At first it served as a model for depictions of energetic and intellectual 19th @-@ century men , and later as a more universal type . Several 1890s works closely echo its form and motifs . Jean @-@ Joseph Benjamin @-@ Constant 's monochrome and severe 1896 Portrait of Alfred <unk> is heavily indebted , while Léon <unk> 's stern 1892 portrait of the aging Ernest <unk> has been described as a " direct citation " of Ingres ' portrait . 
