While the Red and Black boos work, I think the White and Yellow boos would look better in reversal. So instead of being outlines, they would be solid color with the shirt thru-color creating the lines and mouth.
The reason I think it'd work better for reversal to solid on the White and Yellow is because they are both pale colors and the pale colored mouths look odd. Where as the Black and Red are bold and dark enough to work as lines.
The reason I think it'd work better for reversal to solid on the White and Yellow is because they are both pale colors and the pale colored mouths look odd. Where as the Black and Red are bold and dark enough to work as lines.