the next day , after our underpaintings had dried , goya came by to critique the work of the others and to start me on my first oil painting ... you see , when you mix the white with the sienna , you get a nice skin tone , and , yes , put it on the forehead there ... right , like that , but for the shadows on the face and parts of the body , you must add some of the green , the complement to the red of the sienna , just enough ... no , that 's too much ... more sienna ...