"I  need to focus the attention on the girl, so the first thing is to modify lights."

Errm, I beg to differ. My Humble Opinion goes:

1. Adjust Point of View. Pull the camera back a bit, and change the angle so it's not looking "square-on" to the figure (in X-direction).
2. Adjust the pose of the neck/head so that she's looking at the newspaper. At present she's looking blankly into space...
3. (at last) Adjust the lights. There's no reason why the fill-in light shouldn't cast shadows, but as it is it seems too close to the figure, and too strong. That shadow is far too black and sharp.
4. Maybe add some ambience to the very dark areas (the floor, the foot-board of the bed, the lamp's column, the furniture on the right, etc..)

BTW, Which version of Poser are you using? Depending on that, better and more precise advice can be offered...

Cheers,
Diolma