Human > Vector > Cardassianer

A friend asked me to do him a favor. He wanted me to turn his original picture into some star-trek figure... As I start trying doing i realized that it was to hard to do that head-structure onto his pic. So i started to work myself into verctorizing today and tried to change his picture into vector and now i try to put the typical parts of that star-trek guy into the vector-pic

This is how it should look like:

http://www.keewee.biz/art/ziel.png

This is his original pic:

http://www.keewee.biz/art/ausgnag.png

This is what i achieved so far:

http://www.keewee.biz/art/rhenus_uniform.png

Have you got any solutions for the head-stuff or any advises or comments on my vector-art?

It has a very flat look atm. You should add more deeper tones to the skin, as on the original picture. Also, the pattern on the clothes makes it look flat too. Don't really know what to do there.. But work on the face. It looks a bit like he has some sort of lube in his face. :P

well i only used 4 layers because its my first one :) i'm working on my grilfriend with 12 tones now ;)