I decided I had understood enough to start, but then made a mistake on the stitch count, and then the thread snapped when I was pulling the ring tight. I wonder if anyone else has the problem of gaps between the rings, I think I have pulled up close but by the time the ring is pulled tight there is a big space.
I decided to abandon the dragon for the moment and see how it would look to combine the "rainforest" with a machine embroidery thread, which seems much finer, so I had a go at an edging from Mary Konior's book. I don't think it can be the different sizes that causes it to curve like that, but any way I have finished the shuttle, and I certainly like the colour combination.
You need really to click and enlarge the photo, the rainforest is 80, and the machine thread is Gutermann Sulky, probably about 100.
(By the way I used Tattingchic's method for thread winding, putting a cushion inside the skein, and it worked really well, despite interruptions from phone and dogs!)