After the Start Collecting! Undead Horde finally arrived, I didn't hesitate and immediately started working on Arkhan the Black, Mortarch of Sacrament. Since it's going to be a centerpiece of the army, I decided to go for sub-assemblies to get better result and more details.
I will post the process in several parts, starting with the main body of Razarak, the dread abyssal mount of Arkhan the Black.
I started by cutting out the first pieces of the body, cleaning them with a hobby knife, then priming them with Imperial Primer. The reason I didn't use spray primer is because in winter the paint in the spray can tends to thicken.
After the primer dried, I based the skulls with two thin layers of Celestra Grey.
Then I applied Nihilakh Oxide all over the skulls, thinning it with just a bit of water to run into all of the crevasses.
After that I used a mix of Coelia Greenshade and Lahmian Medium to a ratio of 1:3 and applied it all over the skulls, making it sure it ran into all of the recessed parts.
After the shade dried, I highlighted the skulls using Ulthuan Grey.
In the second part of the sub-assembly, I based the bone structure with two thin layers of Rakarth Flesh. I painted some of the ribs and the pelvis with Zandri Dust for more diversity.
I applied a mix of Agrax Earthshade and Lahmian Medium to a ratio of 1:2, and applied 3 thin layers on the ribs painted with Rakarth Flesh and 5 thin layers on those painted with Zandri Dust. The reason why I did this way is because I didn't want the shade to pool up and to run into the area with the skulls. On the tail part I applied just Agrax Earthshade, without mixing it.
After the shade dried up, I highlighted the bones with a thin layer of Rakarth Flesh and on the raised areas, very carefully with Pallid Wych Flesh.
Note that I avoided to paint the parts were I would glue them together, as plastic glue melts the paint and won't be so efficient as on unpainted areas.
That's it, Part 1 of painting and assembling Arkhan the Black. Stay tuned for Part 2 in early January 2017!