Pio Cristiano Sarcophagus 31551: Detail, Jesus, Peter, and the Rooster
Peter holds the wand used in the water-miracle scene. His finger-to-chin gesture is seen in several other paleo-Christian images of this scene, in an image of Pilate, and in one of the Annunciation. According to Sgarlata (127) scholars have suggested a wide variety of significations for the gesture. In all of the examples on this web site it seems to indicate some kind of thought or thoughtful reception of a message.
As usual in this sarcophagus and others of the period, Jesus is a beardless youth with long hair. He, Peter, and the disciple on the right (beardless, so possibly John) are all in togas.
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Photographed at the Museo Pio Cristiano by Richard Stracke, shared under Attribution-NonCommercial-ShareAlike license.