5 x 8 inchesThis is a theme I come back to over and over again. I love the sphere. Marbles or (Canicas in Spanish) are the perfect sphere. They never fail to amaze me with their reflections, shadows and transparency. This is done on black Stonehenge paper with Prismacolors. The secret of working on black paper is to lay a base of white wherever you are going to use lighter colors. I applied the white layers slowly and evenly, not using too much pressure, as many more layers were to come. After layering some color on the marbles, I used citrus thinner to mix and smooth the color. Then, I continued to put on more layers of color. The background is done without the use of thinner.