This is gouache (and a little watercolor, especially that wonderful acidy DS Green Gold) on Arches rough, about 6" x 9" after cropping. It is after a pastel that I saw the other day, by Barbara Noonan.
I scrapped on the thick red-orange paint in the background with the palette knife, which was kind 'o jazzy. I can see that much of the gouache fun is going to be the impasto aspect. Cool!