Attached Link: http://www.renderosity.com/mod/gallery/index.php?image_id=1925762

You might also be interested in the technique I used for this image which I did over the weekend.

I wanted the cranes to be a pure silhouette against the moon, but other scene objects to have a very low ambient glow (an IBL with only 0.1% intensity), and the backlighting on the cherry tree coming from a low spotlight.

I only had a rough photo for the cranes, so I scanned this and created a black and white transparency map from the outlines, and loaded this onto a black Square prop. You could similarly create an inverted transmap from a render of just your figures (completely unlit) against a white self-lit background, and invert it in the shader using a math node.

The moon and its glow are two concentric spheres, both self-lit. The glow sphere uses an Edge_Blend node to control transparency. The falling blossom is a transmapped 'ground cover' prop that came with the cherry trees.

"If I were a shadow, I know I wouldn't like to be half of what I should be."
Mr Otsuka, the old black tomcat in Kafka on the Shore (Haruki Murakami)