“ De Keyser chiefly excelled as a portrait painter, though he also executed some historical and mythological pictures, such as the “Theseus” and “Ariadne” in the Amsterdam town hall. His portraiture is full of character and masterly in handling, and often, as in the “Old Woman” of the Budapest gallery, is distinguished by a rich golden glow of colour and Rembrandtesque chiaroscuro. ”