I blocked in the color, thinning it with oms, over the raw umber nad black wipeout. My main goal at this stage is to ballpark my color scheme and to have some color on the canvas to compare the eventual finished work. I will be asking myself questions such as; is this warmer or cooler than it looks now, darker or lighter, less chroma or more chroma. Because windowshading is such a think-on-your-feet type of painting it's helpful to have an underpainting to make comparisons with. I will use the poster study sort of like a color swatch, in that I will be putting my strings of color directly onto the poster, to make sure that they at least start off as an exact match. This helps to keep the color consistent and not piecemeal.