It's now this:
After coloring in the stamp, I contemplated what I could add around it. First is was the circle border, and then the flowing feathers, although in Zentangle terms they are called "flux". I pondered further whether to color any of that in, and as you can see, coloring won. All this done a bit at a time over many days. Slow, relaxing exploration that I almost hated to see come to an end today. But I have more pages to fill so it's ok.