Cherie, a couple of thoughts: first contrasting colors work best to highlight your work. In this case light on dark. Second, you can play around with Photoshop settings to tone down slightly the light intensity so the grain will show through a bit better. Third, if you're not using the closeup setting on your camera, it will help you get close to the piece and still keep it in focus.
I like your concept and work you're doing, it looks really good.
Bill