Schmidt, Willem Hendrik – Zelfportret, 1840 - 1849 Rijksmuseum: part 1

The picture has something of this: people, man, portrait, weapon, indoors, wear, sword, room, side view, offense, model, gun, war, woman, jacket, two.
Perhaps it’s a painting of a man holding a paintbrush in one hand and writing on a piece of paper in the other with a pen in his other hand.