My recipe for a warm (and worn) leather.
A simpler, less ruddy leather recipe is included in my Salamanders tutorial here: https://paintpad.app/recipes/2325-salamanders-v0-9
Basecoat with Hull Red
Add scratchy highlights and stippling with Orange Leather
Add further scratchy highlights with a 2:1 mixture of Orange Leather : Deck Tan , mainly focusing on the edges
Add another highlight with a 1:1 mix of Orange Leather : Deck Tan