Finally, I recieved my Daemonprince from Forge World!
Unfortunally, it's size is bigger than a Bloodthirsters, wich is higher in rank. That means I probably have to get Forge Worlds Bloodthirster at an insane price.
As for the painting, I have started bascoating the daemons, and will begin with the details soon. I'm trying a new technique for painting skulls: Dheneb stone, wash with Devlan Mud, then highlight with Dheneb Stone, and mix in Skull white for each progressive layer.
Big thanks to the lads @ Games Workshop Oslo for the tips!