What is missing?

Old woman
We do know the painting with the preliminary study (in colour), but not the real one (black and white photo), with which he won the Willink Van Collen Prize.

Le Biginage a Bruges, Belgium 
painting; Height 31.5 in.; Width 44.1 in. / Height 80 cm.; Width 112 cm.; Signed; Christie’s Amsterdam: Wednesday, October 30, 1991 [Lot 00125] 19th Century European Pictures, Watercolours, Drawings, and Pastels

In front of the mirror
A review said: “The figurine of color so stately, as deep as velvet, is the black of skirt and yak of this peasant woman in front of the mirror in her simple dwelling with the white wall, which, ripe in tone, harmonizes beautifully with the black.”

Review: a portrait, its color is excellent, and the languishing in the melancholic head is wonderfully expressed.

Girl from Laren
a portrait: painting

We have 3 photos of his studios and made cut-outs of the works we didn’t recognize yet: