Armor

Base Mechanicus Standard Grey or Dark Grey
Shade/line with Black Templar
Wash with Grim Black : 1:2 Speedpaint Medium

Gold

Liberator Gold then Reikland Fleshshade

Eyes

Raging Sea and then a little bit of Bright Sapphire and White to highlight

Metals

Leadbelcher & Basilicanum Grey

Leather

Base Catachan Fleshtone
Glaze the edges with Mournfang Brown
Highlight with Steel Legion Drab
...
Alternatively, XV-88 all over

Reds

Mephiston Red or Khorne Red

Base

Dirt
Base Steel Legion Drab
Shade Agrax Earthshade
Drybrush Ushabti Bone

Stones
Base Rakarth Flesh
Shade Agrax Earthshade
Highlight Pallid Wych Flesh then Screaming Skull

Rim Matt Black