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Yes, the boar is first traced on damp leather and then lines are carved with swivel knife.

After carving I used various beveller tools and mallet to stamp the outlines and give 3d look. Texture of the background is stamped with a tool named backgrounder (there are different types and patterns). Then the leather is left to dry.

After drying I apply antique finish, it has a form of dense paste. You apply it on the leather and then wipe off the excess.

After drying I apply special finish to give it water resistance.

Thanks for the insight.

Didn't know the technique of bevelling yet, but no wonder as I only used thin leather patches to tailor some bags so far ^^