Below is the painting in an earlier stage. I had begun by laying a smooth wash of yellow gold and blue gray over the entire paper, allwed it to dry, and then added the darker blue pattern of the waves. Once that had dried I applied masking fluid.
Next I used a rigger brush and a Da Vinci Maestro number 8 round to paint the patterns of the dark reflected trunk. You can still see the masking fluid on this version.