Has it been proved beyond doubt that his facial image was used to depict the Mona Lisa and also create the image Jesus in the cloth of the Turin Shroud? If so what was his message?
I've read that he used his own face to depict the Mona Lisa, and in that perhaps he was surreptitiously displaying his homosexuality. I've never seen anything relating his image to the one on the Turin Shroud though.
I would think it points to his egocentric personailty. Pretend it is Jesus and people will rever it for evermore. That assumes he thought he was so clever we would never discover the secret.