Especially on a large painting you want to work on it one section at a time because some of it will dry too much if you do it all at once. This figure is almost life-sized for an adult and that's a lot of area to paint at one time. So I finished the legs first, then her torso from the hips to her breasts, then the breasts, then her upper chest and neck, each arm, each hand and lastly her face and hair.
The top portion of the bench she's sitting on will most likely catch more light than the rest of the surfaces, so it needs to be lighter. But I didn't want to put any white on it so I darkened the vertical surfaces to make the floor and bench seem lighter.