Introduce local colours
I lock the Layers’ transparency and fill them with local colours. None of the colours should stand on their own; they need to have a counterpart. This makes the picture less busy, too. I want to keep the painting light, hence why the character’s wearing mostly white and has pale hair. Using a reduced colour palette helps to keep the image simple and balanced.
Shadows and light
I place a layer on top with a light grey tone for the shadow and then I create a layer mask to erase where I’d like the light to hit the figure. I want to cover her with shadows, to suggest a light source that’s behind her. This enables me to play with subsurface scattering on her hair and skirt. I also create a Linear Dodge (Add) layer containing green to bring in some diffuse light from the sky.