i dont see why this has such a low rating
personaly i love it. i agree that the gun and pack could use some work. maby add some copper to your color scheme just to break up the silver on the metal.
and the head looks a bit weird
btw where did you get that power fist. its cool
The corpse on the ground is really well done, nice shading. But the metal parts look rather uniform, especially the bolter and the backpack. The face needs also more depth.
I have been considering something like this for my upcoming Chaos army, either for the whole army or just for possesed. Funny how many people have done it......
Nice conversion though, I like the little tail!