Hello there! Your portfolio has very impressive work. I particularly appreciate all the EU characters that you keep alive with your models and skins. I downloaded the Jacen/Caedus and Jaina models and noticed that there are no facial animations; the Jaina model appears to be a re-skin of one of your older releases, which itself had facial animations as did other releases, such as your Tenel Ka. Are the Jacen/Caedus and Jaina meshes linked to the face bones on the model skeleton?
For others seeking to add models to MDII, as long is it's for personal use, you can unpack the character's *.pk3 contents into the respective "models", "shaders", and "sound" subfolders of any MDII *.pk3. I personally try to keep it organized and assign the character by timeline; for example, I would place Arcann in the "MD_OTSeqModels.pk3" assets, which has all the models from outside of the prequel-OT-sequel timelines. Next, you need to update the npc directory to reference the new character; go to the "MD_Assets.pk3", extract a copy of a *.npc file from "MD_Assets.pk3\ext_data\npcs\", update the file with an entry for the new character info (e.g. copy and paste a section and change the name to something like "md_arcann") make sure that the "playerModel" line has the same name as the character's model folder (i.e. the one with all the image files, *.glm, *.skin, etc...); if the character came with sounds, be sure that any line with "snd" has the same name as the character's sound folder. Save the edited *.npc file and replace the one in the "MD_Assets.pk3". Load MDII, open a map and spawn your character to test (i.e. npc spawn md_arcann).
Adding the character to any of the selection menus requires you to update the *.menu files in the "MD_Assets.pk3\ui\". The process just requires you to keep track of where the *menu files point in-game. For example, "ingamespawnlegends1.menu" affects only the NPC spawn menu with the Dark Forces II and JO characters, and Mara Jade; if you want to make your new character playable, you'll need to edit one of the "ingamecharacter[TIMELINE].menu" files. Note that these menus activate a set of scripts by hovering over a character icon and clicking on it; you'll need to add this "button" in a blank space or a new page (it's probably easier to start with re-organizing an existing page).
I hope this helps, and hopefully someone can provide input on the face animations.
Stay well, folks!