Are you using a 3-point light setup for your promos?

It's probably to best start there, have your rim light shining towards her and off one over her shoulder so she's popping a bit from the background. The 3 point set up will also give you a light into your eyes to show reflection. 

You don't need too elaborate setups for lights in promos. They just need to pop the character from the background and allow you to show texture and morph details in neutral light.