Hi Joan,
I think the main problem you have with this photograph is the mixing of two different light sources that have two different colour temperatures. It may have not been noticeable with the naked eye at the time, but as you point out is easy to see in the photograph.
Also the top part of the picture is a lower value than the bottom half, again due to a low power, warmer light. This has made your subject look as though her face is in shadow, pulling attention away from her face and onto her bust and hands.
The lower half of the photograph looks correctly exposed, the colour balance on the hands l good.
Using two light sources can work well, I took a reference picture of someone lit from a north facing window and hadn't noticed that my studio door was slightly open. The hall light was on and when I looked at the picture (digital) saw that even though the front of the model was well light with cool daylight, there was a low value subdued warm light on the back of the head and ear. I didn't notice it at the time and this lucky accident worked well.
Try taking the picture again but ensure that you only have one light source, either daylight, or artificial light, however not only avoid mixing daylight and artificial light, but also different types of artificial lights such as fluorescent (which can have a greenish colour cast) and tungsten (warmer and red).
I hope this is useful.
Best Wishes
Vincent
