Backlighting can be used to bring out the details in a leaf, and also to add a "glow" around the edges of objects in a picture. It also helps in separating the subject from its background. I used the evening sunlight to backlight leaves below and capture the intricate details in them as well as add a glow to the spider web and the edges of the leaves and stem.
The backlight exposes the veins in the leaf, and adds a glowing edge to the leaf edges, the sole strand of spider web and also exposes the minuscule strands on the stem with a white glow.
Backlighting generating a highlight on the leaves plus strong geometric composition from the black stem makes this an interesting composition.
All photographs shot using a Canon EOS 400D with Canon EF 70-200mm F/4 L IS USM Lens in the backyard of my house in Trivandrum, Kerala. Shooting wide open at F/4 throws the background out of focus completely and the backlight ensures even better separation of the subject from its background.