Finished painting, demo: http://dianemannionpaintings.blogspot.com/
The setup: EasyL paintbox, north light from window.
Roughed in general shapes in middle value. Only colors used throughout were ultramarine blue, cadmium yellow, napthol red, and white. About 20 minutes.
Worked out main "players" in leaf pattern. Worked warm glow in background.
About 30 minutes.
Painted leaves with warm and cool colors, darks and lights. Left brushstokes with thick paint, blending as little as possible. About 60 minutes.
Worked base and fiddled with leaves a bit more. Finished painting. About 40 minutes.
Total time: About 2 hours, 40 minutes.