In the seven rooms of the upper gallery are Flemish and Dutch paintings of the 16th and 17th centuries (Rubens, Carel Fabritius, Pieter van Aelst (1502–1550), Leonaert Bramer) and French paintings by Renaud Levieux, Jean-François de Troy, Pierre Subleyras and Paul Delaroche's Oliver Cromwell with the corpse of Charles I.
In 1993 the artist Russell Connor painted a portrait in the style of Rembrandt showing the Master, palette in hand, standing in front of the incomplete Polish Rider. Connor attributed the painting to Rembrandt's pupil Carel Fabritius and indicated the canvas was found in a basement in Pinsk.