It's called "Interior with a Lady." You could call it a portrait. For whatever reason the painter, John Koch, did not. Whistler called his famed painting of his mother "Arrangement in Grey and Black." You could also refer to this as an arrangement of colors, red near the top of the list. The lady takes center stage no matter how you slice it.
You can find evidence that Koch was painting in the mid twentieth century if you look closely. The compact electric lamp, for one thing. But he always has the feel of the late nineteenth, when Impressionism is just starting to have a broader influence. There's something to be said for holding onto the old ways, if in using them you're better able to create. That certainly looks to have been the case for him.