Focus on The Burial of St. Petronilla and analyze the Religious interpretation.
Guercino's depiction of Saint Petronilla's burial, is perhaps a guide for the congregation.  In depicting the death of a highly venerated Saint, one whose relics have recently been transferred to the altar in the church named for her father, the reverence for the Saint, for the values she placed on her life, is propelled.  Shared by the congregation are her death and sacrifice. They are even, in a way, part of it.  They are able to see her acceptance into heaven.  In the immediate state they are only able to witness this acceptance through Petronilla. Though through their own sacrifice, reverence and devotion, as they are reminded in the painting, they may be able to partake in the same acceptance upon their departure from earth.
Guercino death relic Saint Petronilla