Hi...

I'm not altogether sure that lighting is the issue.

Did you use Tone Mapping HSV Exponential for this image? It has nice skin tones, but lacks the detail that you got from the PPro GC render in the darker areas.

Also, I'm wondering about that dark pointed shadow across her right shoulder and collar bone... what's causing that?

"If I were a shadow, I know I wouldn't like to be half of what I should be."
Mr Otsuka, the old black tomcat in Kafka on the Shore (Haruki Murakami)