I used the following method to recruit Lianna:

"Any NPC can be made into a permanent follower by targeting them with Dominate Will followed by Reflection Shield, and then cancelling Dominate Will while RS is active."

What i would like to do now is change her portrait so that Lianna doesnt have a generic human female portrait.
But when i create a BMP file named NPCLia and insert it into the /data/Portrait folder it doesnt change the portrait.
So i suppose the method for official followers either doesnt work for exploited followers, or the name convention is different.

Has any ever gotten it to work to change the portraits of exploit followers?