ok i have the holowan plugin for tsl installed, and i want this head in the game too:
http://www.pcgamemods.com/mod/15179.html)
 but i edit the appearance.2da, heads.2da, portrait.2da, and changed the files to 
 PMHM01=mdl
 PMHM01=tga
 PMHM01.mdx=mdx
 PMHM01D2.tga=darkside tga
 po_pmhm01d1.tga=darkside portrait tga
 po_pmhmd2.tga= darkside portrait tga
 po_pmhm01.tga= portrait tga
 PMHM01D1=darkside tga
 And when i went to the new game the head was invisible, what did i do wrong, can someone help me out?