I added more layers of transparent watercolor to build up the colors and definition of the leaf, then I used masking fluid on the white areas/spots on the butterfly wings, and layered the first yellow washes in the wings.
I continued building the yellow color in the wings and adding the black, creating a stained-glass window effect in the wing pattern. By working overall, I darkened the area of the leaf below the butterfly, as well as the area just above the head slightly. I added details of light orange and pink to the yellow sections of the wing, and thin dark lines in the wing pattern. The body is visible through the transparent yellow wing. After many small adjustments, I added my signature - complete !