11x17" across a two page spread of a Stillman & Birn Epsilon Hardbound book
Watercolor and Pitt Big Brush Pens
Sometimes it's easier to tackle a single rectangle than to take on an entire two page spread, so I really enjoy setting up grids for various series of things I want to paint when I'm short on time. You can click the image above for a larger view of the sketch.
Here's my setup below, as I finished up the final section. I have a piece of Coroplast (corrugated plastic that is nearly weightless) to which I velcro my palette and clip on my palette cups. It extends under part of the book, which weights it down so it won't fall over. That leaves me hands free.