Design for the left-hand half of a frame for a painting or a brotherhood catalogue or reliquary

Design for the left-hand half of a rectangular frame, probably for a painting (or for a reliquary?) with a bracket-shaped base with a cartouche. On the left is a decorative support with a winged cherub’s head, crowned by a cartouche with a cherub’s head and a Marian monogram. To the left of this is a cherub kneeling in prayer. On the corner is a vase on a small base.