The woman on the floor
Photo by Juliet Clark

This is part of a section of mosaic portraits in the fourth-century floor of the Basilica of Aquileia. The others are fairly easy to find in reproduction on this postcard, for example:

Nuclear family with fish

But this young woman seems neglected, maybe (the photographer guessed) because her left side's damaged by a column.

Tricky shot, by the way. Hurrah for the photographer!