In New Spain, a nun was often painted like this, crowned and holding a palm and a small holy figure, to mark the day she took her final vows. The inscription at the bottom records her name and the date.
Shop / Portrait of Sor Juana de Nuestra Señora de Guadalupe

Portrait of Sor Juana de Nuestra Señora de Guadalupe
Domingo Ortiz · The Metropolitan Museum of Art
Domingo Ortiz, 1797. The Metropolitan Museum of Art, Open Access (public domain).