The Improved Random Portraits mod requires that images exactly match characteristics such as race, sex, and to a lesser extent age (although images can be tagged with more than one) or the image will not even be listed as a possibility for that person. If no images match those characteristics, then the character will get no image. If only 3 images match those characteristics, it's still possible that you may only see one image due to the weighting of the images; one image may match more non-filtering characteristics and may be hundreds of times more likely to be picked randomly. I don't have the soulcalibur pack so I can't check how good it covers every possibility, but finding good images for every possibility has been a persistent and time consuming problem. The Strive Discord has a small group that gathers a lot of images.
Side notes. For 1.0a Mav changed dark elves to tribal elves and drows to dark elves, which can hinder older portrait packs from providing images for people with those races. You would need to manually change the names of the folders/images. Someone released an updated version of the Improved Random Portrait mod(
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) that includes some bugfixes, it's not a huge difference but worth mentioning.
Save files from 1.0a are perfectly compatible with 1.0d. Those 3 mods should work fine together, though the bugfix may need to be first in the list.