officer models and textures are faction specific. You can change the models in the descr_model_battle for battle field models and descr_model_strat for strat map models. You'll have to make new entries in both those files then go to the descr_character and make sure that the entry for thats factions general is pointing to the correct entries in the descr_model_battle and the descr_model_strat. However, whats NOT faction specific are generals portraits. Those are used for every faction in a culture.