Honestly I would advice against using the swords as your main light source, especially as you said yourself; you don't have a clue what your doing. It is so incredibly difficult to do something like that properly, you need such a masterful knowledge of forms and the way light behaves, and in all honesty I don't think you are ready to do it well; very few people can (I know for a fact I certainly can't). I would suggest using a broader light from a top corner and using the glowing swords as secondary lights to introduce some interesting colour, and help describe the forms better. They will also help with subtly defining things in the very dark areas. I'm looking at it and imagining the light coming from behind her so that her front and face are almost completely in shadow. Then the red sword throws up some illumination and it's creating a cool backlighting effect on her hair, while the green sword is subtly illuminating her face from below, as well as the forms on her torso which you've already begun to do.

 Also maybe try working greyscale for now until you have your values down, before you start worrying about colour. Do a few quick paintovers of a few different lighting scenarios and decide which one you think is working best.

I want to say pleeease don't think I'm picking on you. I admire the kind of scenarios and scenes your trying to create, and that your thinking about the lighting and the whole image as oppose to just a character. I'm just trying to make sure you don't try to run before you walk as you clearly have the skills to create great images!

Peace!

Dan