Please find attached the pictures of the Potraits 2da, Heads 2da and Appearance 2da.
http://img685.imageshack.us/i/apperancebeispiel.jpg/)
http://img130.imageshack.us/i/headbeispiel.jpg/)
http://img193.imageshack.us/i/potraitbeispiel.jpg/)
unfortunately the heads.2da is coming up with an error - bad gateway. But, I can see the other two, and there doesn't seem to be much wrong with them (aside from having three lines numbered as 509, but I don't think that's the problem).
When adding heads for K1, they always need thier own models (which you have as twilek_f09.mdl & mdx). I've always needed to hex edit the mdl so that they reference the new texture. If they aren't hex edited, then the first light side texture will always be the default from the original model (in this case, twilek F02, right?), and all the new dark side textures would work correctly.
So, if you haven't done it already, I think you need to get a hex editor program (there are lots to choose from on the net). Whichever one you get, you'll have to figure out how it finds and replaces strings. Then, replace all instances of "twilek_f02" with "twilek_f09".
for more hex editing tips, look on this thread
http://www.lucasforums.com/showthread.php?t=143421) specifically 2.2) Retexturing. I know it is hard to search for some things with less than four letters (like the word hex), but here is another thread
http://www.lucasforums.com/showthread.php?s=&threadid=134390)