The Good Shepherd in Paradise
First half of the 5th century
Mausoleum of Galla Placidia, Ravenna, Italy
A beardless, youthful Christ sits in the center among his sheep, wearing a dalmatic and pallium and holding a cross. The gesture of his right hand may be intended to suggest feeding, or it may simply be a loving touch.
In the left background is a hill from which rivers flow, suggesting the four rivers of Paradise (Genesis 2:10-14). The same type of hill and rivers can be seen in Lamb of God images on sarcophagi of the period. (See this page) for examples.
This image in full resolution
More of shepherds and sheep in Christian art
Photographed at the site by Richard Stracke, shared under Attribution-NonCommercial-ShareAlike license.