See all the ends hanging? When a design gets tweaked over and over again, I just work with whatever thread is still on the shuttles and add more thread in as I need it. There's no point in starting out fresh with fully loaded shuttles because chances are that I'm going to have several tries at it. I weave the threads in as I go if I can, but if I can't, I just let them hang and then sew them in when everything is done. I don't attempt designing with specialty threads as it's most likely just going to be a waste of thread. Sometimes I load the shuttles and tat the design that's in my head start to finish and it comes out perfect the first time. Other times it doesn't.
Here is the latest result. I think I should re-do it adding a longer chain between the large rings at the top because it wants to cup a little. One extra stitch between the butterflies would probably work out better. It's heard to tell since this piece hasn't been blocked yet.
This was one variation of the image. I have another one I'm still working on. After 3 false starts, I'm about half way through it.