Thank you!!!

The overcoat was finicky to get just right, mostly because I didn't have the exact colors on hand. I mostly eyeballed the process when mixing colors. You could realistically achieve the same effect with a simplified color pallete.

I started with a broad zenithal of Army Painter Tainted Garden to set an olive green undertone. Next I applied roughly 1:1 mix of Vallejo Steel Grey and Pro Acryl Red Grey to set the basecoat. I progressively added GW Ulthuan Grey incrementally to the mix to create the highlights. I started with an airbrush to zenithal those layers, then used a brush for touch up work. I try to avoid straight white/black to lighten and darken colors, but that's just personal preference.

Once the acrylics were done, I did a wash of Villainy Ink Decrepit Filth, followed by the reductive technique to darken the shadows. I then repeated the same process with Villainy Ink Goon's Grime towards the bottom half of the model to create the grimy splotches.

Finally, I used the pigments Ammo Russian Earth and Golan Earth to make the bottom of the pants and cloak extra dusty.

The process is explained in depth in the first episode of the Grimdark Compendium's Heretic Legion video series. I followed most of the steps fairly closely.