I've started working through the exercises in the Botanical Palette book - Chapter One - White. While waiting for the Casa Blanca lilies to bloom so I can paint them from life, I've also started to work on a watercolor painting from a photo I took of the lilies in the garden last summer. The pencil sketch for that is show below. I drew the lily directly on my watercolor paper using an HB pencil and the divider tool to take accurate measurements from the image on my computer screen. It took a few hours, but then I decided it needed to be about 150% bigger. I scanned the drawing, enlarged it, printed it and transferred it to the watercolor paper with graphite paper, then refined the pencil drawing further.