Harvest Moon DS Cute Portrait File Help

I'm trying to do a very minor sprite edit for Harvest Moon DS Cute. Not much, just changing how some of the characters look a little bit. I've successfully found the overworld sprites in the character.bin file, and edited the ones I want to change to my heart's delight. However, all the characters have portraits, as well, to show what emotion each character has when you talk to them.
I can't for the life of me figure out where these portraits are in the game's files. I would assume they're...

Harvest Moon DS Cute Portrait File Help