Black Pits 2 NPC Portrait Question

How can I change Black Pits 2 NPC portraits e.g. portrait for Dulf Ebonbeard? Probably not the right approach, but I tried looking up BP2 characters in EEKeeper and I couldn't find them; only BP1 characters are there. I'm also ignorant of DLTCEP and I could only partially make it work - same result, I couldn't find the BP2 characters or the proper files to tinker.