The right arm lighting seems off to me. The skin tone seems much darker than her face and left arm. The highlight along the edge of the right arm seems to be coming from a light placed too low. It unbalances the image for me.
I'd move the light around in front of her somewhat and raise it up a bit, say just above shoulder level.
On second thought, I'd be tempted to put the light directly behind her to provide some hair separation, and use a reflector or have her turn slightly to her left to put light back on that arm. There is some hair separation from the background, but if her hair is really that red, I'd show it off.
I have to agree with the others. It's difficult to critique small images. The bigger the better, at least 600 pixels high.