Armour

1. Basecoat armour with a mix of Blue 1:1 Turquoise
2. Recess shade with Blue or dark line with a mix of Blue 2:1 Black in all recesses of the armour
3. Apply a thick edge highlight with Turquoise
4. Add a thin line of edge highlight (possibly within the earlier one) with a mix of Light Turquoise 1:1 Pale Sand
5. Selectively highlight areas where edges meet with a mix of Light Turquoise 1:2 Pale Sand

Leather

More detailed leather recipe is in my https://paintpad.app/recipes/3392-dark-worn-leather recipe

1. Basecoat with Chocolate Brown or a mix of Chocolate Brown 1:1 Mahogany Brown
2. 1st highlight with Mahogany Brown
3. 2nd highlight with a mix of Mahogany Brown 1:1 Cork Brown
4. 3rd selective highlight with Cork Brown