Problems for modding portraits on historical battles

Hi everybody. I have a problem on having tried to finish the historical battles of the game with the battle editor. In the portraits section, have changed some original portraits of the game into other correspondents to personal details like Julius Caesar, Pompey or Mark Anthony. When I have stopped creating the battles, with all his corresponding units, it turns out that there always goes out for me for defect the image 001 of the portraits of the game. I have tried to change names and nothing, always the same image. I would like knowing if there is some form of select the portrait that more is convenient for the general that you have chosen for the battle. A greeting