 The Stockholm drawing contains a narrow blank gap to the right of the bishop with a few <unk> lines that could represent the lower profile of the kneeling figure of Saint Catherine . Although none of the faces in the three surviving panels match any in the drawing , a 1971 reconstruction by art historian John Ward — which combined all of the works into a composition of a central Virgin and Child flanked by six saints — is widely accepted . The Stockholm drawing 's original location or history before the 19th century is unknown , except that the <unk> shows a surviving carving of the Virgin and Child attributed to a Brussels workshop from about 1440 . This carving is also now in Portugal . 
