i used 247, 175, 200, kinda trying for halfway between the red and white, while being distinct from the other mods i use. did the same thing with a few others i like, including tweaking a few flags to be more appropriate imo. dont rightly recall which all i modded, so here is my list of how my factions look if yer interested. i know i tweaked the flags for iron shell and hazard mining to be more in line with their new faction colors, outright replaced the terrible pamad flag, and changed the naming conventions on em all for consistency. but not sure that is all i did. few of the colors are still pretty similar, but im happy enough to not tweak em further for now.
welp, console might help with testing, because that i got the same behavior naturally or forced. but again, it might just be on my end. somehow. genuinely baffled, i am not completely clueless when it comes to modding, but i cant figure out at all what would be causing yer HVB to lose their portraits. it is, tbh, the only serious issue with my install, the only thing i really feel the need to fix. but after reverting to a fresh install of your mod, i am not sure what more to try.
i really like the idea of the hiver swarm, and/or other aliens. more individual monsters than civilizations personally, but dont want to stick things in that dont feel 'vanilla'. that is why i like JYD and carter so much, they feel much like they coulda been included with the base game (though i get a wierd thing with King's Cove displaying the name wrong on the sector map, with a ? instead of ', which i modify in my save directly which solves that on a per game basis, but is a minor nuisance). as an aside, that 'kingdom of terra' mod has a few ships that would make FANTASTIC roaming space beasts, but as a faction... immersion destroying.
edit - even managed to add some portraits for the bultach guys, who did have blank portraits, without issue. so really dont understand why i cant figure out the issue i am having with your hvb. and only them. yer other portraits work fine, and other hvb work fine... but something about your hvb just isnt for me.