Spray with Mephiston Red - this can be partially zenithal if wanted, but should be fairly thorough as the red is the main colour of the cloth. Sadly the in-pot version is a brighter colour so mistakes later will be harder to clean up neatly than ideal.
Basecoat the armour with Retributor Armour .
Shade the entire model with Druchii Violet .
Details
Paint in the belts, eye-hole, and leatherwork such as gloves and boot tops in Black Templar .
Paint in any steel such as the blades of weapons in Leadbelcher .
Apply Dryad Bark to any wooden sections such as hafts of weapons.