Overview
This will show you the basics of adding images for your custom races
How to do it
First you want to navigate to DocumentsMy GamesGalCiv3Factions
IMPORTANT
The images must be in the Png format and and
should have a transparent backgrounds so you can see custom backgrounds or the in game one
Here you will find four folder but you only need three of them for the basics LeaderFgs Logos and portraits.
In leaderFgs you want to add the leader of your faction you will see when you trade with your faction, the picture need to be 1920 x 1080 pixels.
In logos You want to add the logo of your faction you will see on the screen while on the main map, the logo you chose need to be 128 x 128 pixels.
In portraits you want to add a portrait for your leader that you will see while selecting your faction and in other parts, The portrait need to be 128 x 128 pixels
also thanks to mansen for pointing out three things i forgot to write down [link]