I dreamed last night that I saw someone being decorated with delicate, henna-like lines, from head to toe. The process itself seemed warm and caring, and the art was beautiful.
For me, lines are related to the process of writing, and henna is linked to the support of women for one another.
Try this: Write a scene in which your protagonist becomes a canvas. How does it happen? Who does it? How does it feel? Is the art temporary or permanent?