I have continued adding detail and more under-painting in the ceiling part of the composition with reflections and shadows in the dark areas, which will add interest. Large 'black' areas, in a painting of the style I like to paint, do not work for me.
I don't use black paint in my work, instead, I make a dark colour, using indigo and burnt umber. This is a technique I also use when using watercolours, where I also eliminate the use of white. I use white in my oil paintings, though, as an area left as the white of the canvas, has an appearance of being unpainted. It needs the texture of the brush strokes to unify it with the rest of the canvas.