Bob,
You've done well. I particularly like #s 3 and 4 here. The post in 3 is great, and the concept and texture in 4 likewise.
In the first two, I think the lighting is too harsh, with, in 1, not enough light coming around to the model's lh side. either move the light further around towards her front, or use a reflector camera right.
In the second, the shadows are indicating that the light is just a bit too harsh ... use a larger light source, or a modifier to make it seem larger and softer.





cmon ppl, there are some good portrait people out there with knowledge to share.