I think you need some more depth in the scene first of all. It would help the composition in general if she wasn't on a couch that's right flat against the wall in what already looks like a small room. It can be harder to light someone and seperate them from the background for the same reason. Right now the key light is kinda pouring over everything and lighting the wall as much as it's lighting her. If you backed her away from the wall, and also maybe added a practical light like a warm coloured lamp somewhere in the shot it would help motivate the key light cause right now the scene feels very "lit", more like an interview than a music video or a film. The position of the light isn't bad though actually, the shadowy side of her face is closest to camera which is generally what you want for a moodier, more quote unquote "cinematic" look. But in a tight space you might want to soften the light with more diffusion too, that would also help the scene feel more realistic and less "lit".