Pietro Cavallini
The Apse Mosaic at Santa Maria in Trastevere: Detail, the Annunciation

The mosaic has some features characteristic of early and Orthodox images – the veil, the throne, the swirling garments on the angel, and what appears to be a basket of thread on the right. More western and medieval are Mary's hand-on-breast gesture, the dove on the light beam, and the face of the Father in the upper margin.

View the mosaic in its entirety.
Read more about the Annunciation.

Photographed at the basilica by Richard Stracke, shared under Attribution-NonCommercial-ShareAlike license.