I made a new BMP file for Grace (the large one that displays in the journal: JRFFGKN.BMP). Is there an easy way to get the game to display this in place of the old one? Something easy I can drop in the override file perhaps?

Well, uh, you answered your own question. Name it the same and drop it into override.

I tried that before but it didn't work. But it worked when I tried it just now. Maybe I didn't quit and restart the game before, just reloaded? Anyway, thanks!