Quote - I do not know how to add (*or what to add!) to get lighting in the front of the character, to fill in the scene without disruprting the atmosphere I created?

That's VERY easy once you now how to do it: add a Point Light to the scene in front of your Poser character, and somewhere in the object settings of that Point Light there's a setting "which other objects should be influenced by that light".
You can check a box named (from memory) "Include only marked objects". Now you can edit the tree view below and select the objects which should be influenced by that light.
Select your complete Poser character including clothing.
For indoor scenes it's often a good idea to remove/decrease the shadows of that light.

Add more lights to taste.

Tom