Inside the Data folder which should be in the same directory as the CHITIN.KEY, inside the Portrait.bif in the Data folder. You'll need an editor like Near Infinity to extract them.
@Lemernis, if what you want to do is just use the BG:EE portraits in BG2:EE, then you can use EE Keeper to extract them and move them.
Create a character with the portrait you want to move, and bring that character file up in Keeper. Under the portrait, there is a button that says "extract". That will place a copy of the portrait into your portraits folder, which you can then use on your own computer.
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You'll need an editor like Near Infinity to extract them.
Create a character with the portrait you want to move, and bring that character file up in Keeper. Under the portrait, there is a button that says "extract". That will place a copy of the portrait into your portraits folder, which you can then use on your own computer.