This oil sketch was done on a 9×12 Artist’s Carton Panel by Guerilla Painter. It is quite absorbent and took me a while to build up enough paint to really get the painting where I wanted it. The papers are convenient to use, but I’m thinking they could be gessoed or coated with an acrylic primer before I use them again.
Also, I only used three colors to paint this, Naphthol Red, Ultramarine Blue and Cadmium Yellow.
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squint your eyes 
Your red, blue, and yellow
make for a fine fellow,
who is lost in deep thought
about clothes he forgot.