Dear me, it's been a long time since my last post - I've been rather busy with other, non-sewing, things, so sorry about that. I'm getting back to my stitching now, though, so things should get back to normal soon.
I've made a start on adding some colour, starting with the darkest shade, Madeira 1912, at the edges of the leaves:
I then started the shading, adding some more stitching using one strand of 1912 and one of 1910:
More shading next.