I agree, she looks very nice in #5, but I think there is just too much cluttering stuff around her going on. Perhaps you could crop some of that out? I feel the same about #4, she totally gets lost with all of the other visual stuff that's going on around her. BTW, she is very beautiful!
I've just got to say that I am not liking that sepia toning. It just gives a very unpleasant look to the photos. I think you should either keep them in color, or go black & white. If you just really like sepia, try toning it down a little bit so that you have more cremes and beiges and not so brown and tan. It doesn't sound like a big difference, but it will make a huge one.