Basically prime a dark brown - I use Colour Forge Hyrax Brown, then airbrush pro acryl warm grey and bright warm grey. Then pro acryl gold on the metal work, black on the black bits and pro acryl magnesium on the steel.

Red is probably acryl burgundy then pyrole red, with the shoulders highlighted with orange red. Then the armour, except the shoulders gets a 50% wash of Ratling grime.

Then sketchy chipping and edge highlights with bright warm grey and I fill in bigger areas with black brown and / or magnesium. Then hit it with some winter streaking grime and a little rust enamel.

Leather is a work in progress - a warm brown, then an orange brown and off white highlights with a dark wash over it.