With one exception, I found sample signatures for every artist in my Salome Photo Bomb diptych.

gentileschi_judith beheading holofernes  artemisia gentileschi signature

hans baldung_salome  baldung signature

[ Hans Baldung Grien ]

salome_solario  solario

cranach the elder_salome  cranach seal

[ Lucas Cranach the Elder ]

beardsley_salome_kiss  beardsley signature emblem on salome

[ Aubrey Beardsley ]

klimt_salome  klimt signature

I haven’t found and example of Bernardino Luini’s signature yet.  I’ll keep trying.