Who is hiding behind the mask in The Astonishment of the Mask Wouse?

In 1889, James Ensor painted The Astonishment of the Mask Wouse, one of the top works of the Ostend Master, which has been in the possession of the Royal Museum of Fine Arts Antwerp since 1926. (1)
James Ensor, Astonishment of the Mask Wouse, 1889, collection KMSKA, inv. 2042
James Ensor, Astonishment of the Mask Wouse, 1889, collection KMSKA, inv. 2042 - CC0
Honoré Daumier, Mr Royer Colas en vieille marquise de l'ancienne cour, 1833, published in Le Charivari
Honoré Daumier, Mr Royer Colas en vieille marquise de l'ancienne cour, 1833, published in Le Charivari
Honoré Daumier, Masques de 1831, published in La Caricature, 1832, collection The Met
Honoré Daumier, Masques de 1831, published in La Caricature, 1832, collection The Met - public domain
Vlaamse Kunstcollectie - EN

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