DS4.5 render, no post-work.
By the window at sunset.
version3, what do you think could be improved with the picture? What is it that you are going for? You have a very lovely composition going with this portrait. As Frank says some shadow from the window would add some more interest and realism to the picture.
If this was my scene I would setup a three spot light configuration.
My lights would be setup in this way. See lighting diagram for a visual.
Light placement reflects the room configuration and location of the sun. The left and back lights are coming from room-lights, which sources can't be seen. For these two I would place the spots above her head so that the light comes down at about a 45 degree angle to start with. The right spot would come through the window and be the same angle as the sun light. I would turn on shadows on the left and right spots and do diffuse only on the back spot. Once this was set up I would play with intensity, color of the lights and the spread angle of these three lights. The goal being to frame her in light so that my eye goes to her face and not to the shinny necklace on her chest.
As always these are just suggestions. Good luck.