 Ingres seems to have adapted elements of the approach and technique of Hans <unk> 's <unk> Portrait of William <unk> , now in the Louvre . Neither artist placed much emphasis on colour , preferring dark or cool tones . The <unk> portrait seems to have informed the indicators of Bertin 's aging and the emphasis on his fingers . Jacques @-@ Louis David also explored hyper @-@ realism in his depictions of Cooper <unk> ( 1802 ) and Emmanuel Joseph <unk> ( 1817 ) . In the later painting , David shows tiny <unk> of light reflecting on the sitter 's chair and <unk> details " every <unk> <unk> of [ <unk> ' ] closely cropped <unk> hair . " 
