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The mouth issue is due to the facial bones in K1 & K2 being different. If you just port a head without correcting that, then they'll be animated improperly. I've posted a sort of mini-tutorial on it here.

I'll try a little tutorial: Conversion: With KotOR Tool you extract pmhc07.mdl (from Kotor II -> BIFs -> models.bif -> Aurora Model) and pmhc07.mdx (from Kotor II -> BIFs -> models.bif -> Aurora Model Extension). Now with MDLEdit you load the mdl file, just to see which supermodel you need (it's almost always S_Female02, but still good to check). After loading the file, on the bottom half of the window you see "Header", click that and on the top half of the window you see "Supermodel: S_Female02". This is the supermodel from K1 that you need (the supermodel from the game you are porting to is needed). The mdl and mdx of the supermodel need to be in the same location as the model you're trying to convert. So, in KotOR Tool you need to export those files, Kotor I -> BIFs -> Aurora Model / Aurora Model Extension -> s_female02.mdl/mdx. Preperation for conversion done. Now you open MDLEdit, make sure the KOTOR1/KOTOR2 button below the menu is on KOTOR2, because you're loading a K2 model. Load the mdl file, you might think you can now just switch to K1 and save a binary file, but no. You can now switch the button to KOTOR1, you Save -> ASCII, then you load that ascii file, now you can save as binary (which the game can use). Put the mdl and mdx in K1's override folder. Textures/portraits: K1 has 2 more darkside transition phases and the filenames work slightly different. K2: neutral/light, halfway dark (...d1), full dark (...d2) K1: neutral/light, 1/4 dark (...d1), halfway dark (...d2), 3/4 dark (...d3), full dark (...d) With PMHC07 you're in luck, the portraits all have the same pose, so in an image editor you can combine different images to get the intermediate phases. For example, load the neutral portrait, add the halfway dark portrait in a layer on top, set the opacity of that layer to 50% and you get K1's d1 phase portrait. You do pretty much the same with the head textures. Portraits: Kotor II -> ERFs -> TexturePacks -> swpc_tex_gui.erf -> P -> po_PMHC07/po_PMHC07d1/po_PMHC07d2 Head textures: Kotor II -> ERFs -> TexturePacks -> swpc_tex_tpa.erf -> P -> PMHC07/PMHC07d1/PMHC07d2 2da files: To turn this into a mod you would need to use the TSLPatcher, but that's a bit beyond the scope of this tutorial. You can however study the changes.ini file that come with one of my mods that do something similar, it's mostly just changing P[M/F]H[A/B/C/H] values to PMHC07. There's no PMHC07 in K1 so you can stick to that name. To test things for yourself you need to add lines to portraits.2da, appearance.2da and heads.2da (You can extract those with KotOR Tool to your override if you don't already have these in there. Kotor I -> BIFs -> 2da.bif -> 2D Array). You can add a new line with the * at the bottom of the list and you can copy lines to that new line, so copy another row (for example an existing PMHC one, right click the "button" of an existing line, left from the first column -> Copy Row, similarly you can paste that on the new row). Make sure you change things accordingly. Portraits.2da lists the playable characters and points to lines in appearance.2da, appearance.2da points to a head in heads.2da. In this case I would repeat how things are done for an existing pmhc, for example pmhc05. Good luck and happy experimenting