Backdrop makes me think this pic was taken in bed under teh sheets. Nice and bright, no shadow on teh backdrop from the model, nice. the backdrop needs to go...lose the wrinkles, move it back (3 to 5 feet) and get it out of focus or darker or through a colored light on it.
You are off to a good start. A few ideas for you to consider. Reflect some light into shadow under chin. Shoot at several exposures especially when you have something as reflective as the highlighter. Move the backdrop further back and iron it. She really is a great model. A 7.