The Evangelist, Saint John the Beloved, is seated next to Christ, as the youngest of the disciples, he is depicted as beardless. He receives in his left hand a piece of the Body of Christ.
Judas Iscariot the Betrayer without halo is depicted dipping into the dish (Matthew 26:20-25).
Protaton Karyes
Lavra
Lavra, Trapeza
Vatopedi
Vatopedi
Chilandariou
Dionysiou
Docheiariou
Filotheou
Xenophontos
Herman Voogd
Athos - Agion Oros 
Very Nice collection of paintings.
I Thank you so much for this excellent photo album. I am in the process of designing an icon of the Mystical supper and this is very helpful to me. In CX, Filea