The Card Pickers by TCC & GBDL
The basic effect that can be performed with ‘The Card Pickers’ is simple: a card chosen and remembered by an audience member. You point to a face-down card in the painting on your T-shirt and reveal it as the chosen card. Then, you extract the card from the painting, allowing the audience member to confirm their choice. Remarkably, you return the card to the painting, face-up back where it belongs ! The audience can then confirm that the card is indeed back in the painting !
https://www.youtube.com/watch?v=ljbr1JkNSxg