I'm feeling my way along here, trying some new and experimental things. From the previous painting of Rosie that I did like this, I know that layers of gouache on top of stamp pad ink will mask the stamps, but not completely hide them. So I stamped these squares knowing that they would mostly be hidden.
This is what I used for the stamps. I like this ColorBox ink best. The colors are rich, the stamp picks the color up easily, and they are archival. To block out the parts of the drawing that I didn't want colored, I lay a scrap of paper over that bit and stamped right over it. I let it be messy and imprecise- a good thing for me to practice.
Then I painted the first layer of the backgrounds.
Here is my cover painting almost done. Remember those carved brayers I was talking about? I want to be brave and roll a transparent white polka-dot brayer right over the background wall. Wooohooo! I have to do some practices first and make sure it will work!