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I laid several different designs out on paper first, then copied (not traced) this design choice (a mix of the design features I drew) freehand onto the buckskin with a pencil.
I have several small bottles of fabric paints & dyes from a craft store, and a pack of small artist's brushes.
I cut the brush bristles at an angle with a razor blade, filled in the various areas with color, and did the black outlines with the thinnest brush tip I had.
Then, after everything dried, I stained the bright yellow buckskin (chrome tanned ? ) & the design with a brown gel stain, wiped off when still wet for an "antique" effect.