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Tammy, grate choice of composition! I find the vignette to be a interesting creature. I am not sure if I will answer your question but will share something on the subject.
As I'm sure that you know a vignette must compliment the subject. I believe and personally like when I can balance the canvas, space and value, with the subject. To put this another way, all shapes should convey a story even the negative space around the vignette. As for the rules I believe there are no definite rules rather experiments that worked and are used or categorized as rules.
I have found that in a painting there are a number of ways to introduce a vignette. Using shape, value, hue and temperature one can bring the viewers eye to the designated points of entry. I find that at times it is difficult to envision these things but the procedure is simplified as is in representing form.
I hope that I was able to give you some ideas.
All the best to you.
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