Here I've laid in a light base layer for each feather, and have started going down from the violet bib. Painting iridescence is something I'm still working on, but strong value changes are important. I've also started darkening the shadows on the bib.
More of the same, an hour later:
And...another hour and a half. Almost all the feathers laid in.
Working on the flower stem and the wings (another hour and a half of work):