My first piece of advice is to look beyond the photography and take some art classes or get some good books to read on lighting and the effects of light on the subject. If you have ever studied the great masters of painting you will have seen some of what I'm referring to. After all the image is light and shadow mixed with the cultural and emotional responses to the subject. If you know what you want to shoot you need to know how to bring out the image in a meaningful way.
I found a book at the local library once called something like "Twice Reflected Light" or something along those lines and it was a revelation in how the light and it's environment affects each other. I haven't been able to find it again, I'd love to have a copy as a permanent addition to my library.
Once you know the light you may find you are getting what you want or will know more of what you want to do with your photography.