The portraits themselves won't cause any issues, they're just images in a folder. You don't even necessarily need a "pack", you could put images in yourself (I've done this trying to find images that fit a particular character well).
aparticularpineapple
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A member registered May 28, 2017
Recent community posts
Strive for Power community » Portrait packs · Posted in Would I be able to simply add a portrait pack and continue on my save file?
Strive for Power community » Bugs and Suggestions · Replied to Strive4Power in Old Bug Report Thread
I'm playing 0.4.3b on Windows, and I can't end day. It doesn't seem to function at all (clicking the button or using the hotkey), at first I was playing with a character from 4.2 and thought the problem might be related to that when I started on 4.3, but i created random new characters and it still wouldn't work.