Luca di Tomme (active in 1356-89 in Siena) – John the Baptist (100x49 cm) 1390s J. Paul Getty Museum

The picture has something of this: saint, god, book, church, holy, prayer, aura, chapel, spirituality, cross, Gospel, belief, sacred, worship, religious, religious belief, virgin.
Perhaps it’s a painting of a man with long hair and a beard holding a piece of paper in one hand and a sign in the other hand.