Here is my attempt. Sewing on the lines was reasonably successful, but my backtracking is a bit obvious. I decided to do small pebbles in the spaces of the motif and small stippling around the outside of the motif. I started off small, but found my hands were cramping, so changed to a slightly larger stipple. A very basic stipple - oops, I look like a beginner - that's ok, I am a beginner.
|Some of the marking pen is still visible|