I'll do image by image!
Yuri: Keep the one I have. Mostly cause its his SH1 art, and that's the design Yuri has in MF6, so consistency! I don't care if FF6 portraits were inconsistent (Gau's hair anyone).
Vyse: Looks fine, just looks like there are some disharmonies around the hair? Looks like it could use a bit of touching up.
Virginia: Works.
Tir: The image is fine, but I specifically chose the Suikoden 1 art cause it was crappy Suikoden 1 art used in the game itself! Tir should not look half decent as a result
Terra: Don't use her Dissidia art, keep the FF6 one.
Shady: Yeah, Shady was probably the big "Dear god this needs fixing up" cause it was a quick crop -> lower to 16 colors (which lost a lot of quality) -> post in. Kept meaning to ask if you could fix that up.
Ryu: Don't use. I always hated that shot of Ryu5, and actually wanted the one I used. Heck, it was that shot that made me despise Ryu5's design at first (I've since warmed up to the design, obviously, but I still hate that shot.)
Prinny: Fine.
Lina: It sucks! You suck for the massive changes you made! Go die in a ditch!
This is a joke.Lenneth: Looks like a little more work could be done with that one since it looks a little too...pixelated? I know, FF6 portraits, I don't know, hard to put my finger on it, but something about the coloring is a little off. MIght just be the base picture leads to that problem and there's not much you can do with it.
Laharl: I used the shot of his I had since it gave more of that "Evil Mad Dark Prince" look, rather than a generic emotionless face from his Dis 2 art, so...wanna keep the image I used, if fixed up.
Ike: See Lina.
Fayt: I'm...sure that's NOT the image of Fayt I used. Cause I'm sure he was looking a little to the side and what not, this one is clearly looking out. I'm pretty sure I used a shot of him where he was rendered. You sure about that?
Foomy: I liked using his actual sprite as his portrait, cause that's what Lufia 2 did in its character portraits. Granted, if you wanna replace Foomy's sprite with a DIFFERENT Foomy sprite (like a lesser level), that's fine.