Focus on The Cardsharps and discuss the Composition.
The painting shows an expensively-dressed but unworldly boy playing cards with another boy. The second boy, a cardsharp, has extra cards tucked in his belt behind his back, out of sight of the mark but not the viewer, and a sinister older man is peering over the dupe's shoulder and signaling to his young accomplice. The second boy has a dagger handy at his side.
It was the second such painting Caravaggio created. The first, The Fortune Teller, had drawn attention, and this painting extended his reputation, small though it was at this stage. The subjects of The Fortune Teller and Cardsharps offered something new: realistic scenes of street life, especially with this beautifully rendered attention to little details such as the split fingers on the older man's gloves, or the teenage cheat's anxious glance at his master. The psychological insight is equally striking, the three figures bound together by the common drama, yet each with his own unique part within the larger play – for if the innocent is being duped, the other boy is no older, another innocent being corrupted even as he cheats his gull.
The Cardsharps, with its mixture of brutal low-life realism and luminous Venetian delicacy, was much admired, and Orsi "went around acclaiming (Caravaggio's) new style and heightening the reputation of his work." Caravaggio appears to have produced more than one version of the work (as discussed in the provenance section below). Over fifty copies and variants made by other painters have survived, with artists such as Georges de La Tour painting their own appreciations of the theme.
Caravaggio The Fortune Teller cardsharp Georges de La Tour