I have two passions in my life - God and photography. I realized yesterday while working on this image that they have one very important thing in common...they both get you looking for the light. :D
For this image, I darkened an already dark BG and then went to render/light effects and chose an omni light to sit behind the front wings of the butterfly. Then I set my opacity to 15% and lightly masked a small area around the outline of the butterfly to barely separate him from the BG.
Wow, that is really nice. I love the BF, that is one tremondous effect, it looks like there is a small hot spot in the wings. The light area along the stem I find a bit distracting, more so the wider, lower part.