I believe the other pieces are the Chaos Lieutenants head, backpack, axe and the axehead from the Khorne Lord on Juggernaught model replacing Kharns chainaxe, I can't realy see the axe that is replacing the plasma pistol but I'm guessing it's the lieutenants axe.
This mini is easily an 8. It's nicely converted and nicely painted I personally like it. I can see that you have used Karn the Betrayers body but what other parts did you use?