by JaoSming on Wed Jul 20, 2011 11:57 pm
using the mod tool you need to open the portraits.iff file
here's the tricky part, in the REDitor (free version works for this) on the players tab there is a Port_ID which tells the game what portrait is assigned to that player from the file. Unfortunately, the portrait file does not follow the same numbering system. So you need to overwrite existing portraits with known port_ID values and give that value to your new player.
Edit, nuts to that, I just found a map of the portraits file, a new tutorial will be posted in the tutorials section soonish.