Beth,
If you look the image of my model stand in this post
http://forum.portraitartist.com/show...&threadid=1540 you can see the set up shot with a wide-angle lens. (Without the screen)
In the upper right you can see a light fixture and the edge of a curtain. That window and the lights directly above it are the only light I use. The color of this light is cool light. It is fairly unchanging through out the day, and when there is enough natural light on bright days, I do not use the artificial lights at all except near evening as the light fades. The curtain is a sheer; it helps diffuse the light. At the bottom of the window is a shade that pulls up so I can control the amount of side lighting.
As for reflectors: The screen itself is white under the drape. It has 3 sections. One section that is not seen on the left wraps around the left side (your left as you look at the image). If I take the drape off that section or use a lighter drape, it reflects more or less light depending how I move it. Even with this dark drape it reflects, but it reflects the green color of the drape in the shadows on the left side. I use no other reflectors or fill lights, since my intent is to keep the darks dark. And since I do not work only from the photos, it is not that important that the camera can capture a lot of detail in the shadows.
This is a setup for a very simple painting; it is not suitable for every possible situation but for most of my work, it works out OK since I do not get many full-length commissions. But if I did, I would need more room than I have in this studio. So right now, until my new studio is completed, I either go to the client's location (which I do sometimes anyway if they want d