This is all going better than expected! I've now finished the fourth one in the series, though it does have rather less stitching in it than the others.
Here's the design, as a transfer on the lining fabric on the back:
Then overstitched with running stitches to transfer it to the front:
And then stitched properly in chain stitch, with Gutermann silver metallic thread:
Just one more to do in the Abstract series.