I really wish the portrait of the npc you were talking to appeared next to the dialogue, but more than that, I wish there were more than one portrait; different ones according to npc disposition: one sad, one happy, one angry, etc.
The idea for this came from Fallout, I loved the talking heads on that game and getting that feeling of "****! The dude's pissed!" before he even said anything. On the other hand regular npcs didn't have much to differentiate themselves. Limited resources, i know, which is why I think static portraits might be an affordable alternative.
Of course I don't expect this for every npc, I sure rather have no portraits for random npcs if it might get me more portraits for companions.
What is your stance on portraits, not only this, but in general?