Before and After. One under exposed image, that was alright compositionally, but needed lots of work to bring it up to standard.
Basic Level adjustment using white picker to set white point on background to bring it whiter.
Spot heal any debris on the floor.
Copy layer, blur it and set layer to hard light.
copy background lay on top of blur layer and use high pass to bring some of the edges back.
Merge the top two layers together and slide opacity to desired value.
Use rubber tool to rub back some detail from the background layer.
Flatten image and dodge and burn eyes and lips to bring a little depth and light to certain areas.
Copy this layer and diffuse glow filter, slide opacity between this layer and the background to desired value. Finally, highlight and shadows played around with !