From Wikimedia; I lightened the image to bring out her coiffure.
Luyckx shows the details of Cecilia Renata's wide criss-crossing lace collar are well depicted in this portrait.
Keywords: 1639, Luyckx, Habsburg family, Cecilia Renata, Vasa family, Archduchess, Queen, Polish, proto-hurluberlu coiffure, bangs, high neckline, lace collar, puffed virago sleeves, bows, waist band, natural high waistline, order chain, earrings, brooch, rosette