ChroniC said:The first is excellent, it very hard to get a perfect black and a well lit subject, is there any photoshop work done to tidy that?The second is good but i feel for me a little overexposed.
Good effort though, care to share your set up?
Both you and your main light need to be lower. What focal length are you using? I think you might need a slightly longer lens for this particular person.
What is the purpose of these pics? I don't want to make any more specific comments until you answer this.

On the second pic, you are getting stray light on her cheek that is not facing your main light (around the chin). I don't know if this was intended, but it is not something I would do. I guess it is personal preference. If it was not intended, then either move your light further towards the backdrop, or move the model forwards. The lighting is pretty flat in the second pic (Something I am also very guilty of sometimes). You can separate her from the background using a hair light or rim lighting.