This work is (loosely) based on the form of a type of unicellular life form (a diatom, which is a type of phytoplankton. There are over 100,000 different living species so please don't ask me which one this is!).
The detail seen in microscopic images of the diatom are way to detailed to faithfully reproduce in embroidery on paper, so what you have here is my own interpretation, which is, of course the whole point of the artistic process.
You can see the subtle variegations in the thicker orange, blue and red threads. By creating threads with several different, subtle shades of the one colour, the resulting image becomes much more visually exciting.
I like this one a lot. I think I'm finally working out the technical and visual complexities of working a detailed image on a densely detailed background.