I'm not clear on exactly what you're asking for. But perhaps this excerpt from wiki.galciv.com might help:
Click the "Choose Portraits" button to bring up a screen for selecting the images for your citizens. The game comes with several to choose from; you can add your own still images by copying them to the citizen portrait folder. The PNG image should have an aspect ratio of 1:1. The recommended resolution is 128x128. The default path to the citizen portrait folder is C:\Users\(Your username)\Documents\My Games\GC3Crusade\Factions\CitizenPortraits
To add a portrait, select it and click the "Add Male" or "Add Female" buttons at the bottom of the screen. To see which portraits you have already added, click the My Portraits tab at the top of the screen.
When a new citizen is generated, the game will randomly assign a gender-appropriate first name, last name, and portrait to it.