Me and Mokyun (in Mayonaka Midnight, dunno if Mokyun comes around these parts too) are rippin' and renderin' the portraits, using screenshots from the in-game gallery, like those pics you posted... though the ones I have are bigger, because my console's set to 1080p instead of 720p. They're far from perfect but, for now, they will do! I tried different things to open up the files but I'm no good at that stuff so of course I couldn't do anything. Checking them in a HEX editor and they seemed to just be uncompressed files, unlike the ones that are compressed and have to be uncompressed (which are the ones that can be easily ripped, which are all in the first post)... was kinda weird...
Anyway, the portrait rips.
Here's the ones we have so far (they're huge, seriously):
-Elizabeth (rendered by Mokyun): Normal - With Glasses
-Yu Narukami (rendered by Mokyun): Normal - With Glasses
-Naoto (rendered by me, wheeeee!): Normal - With Glasses
Dunno when we're gonna have the rest done, but I guess I'll keep ya'll updated.
Oh yeah, I should take this opportunity to thank Circuitous directly. Thanks for the rips, man.