A silhouette is the image of an object showing its outline/feature, usually being black. This is a simple photo showing the feature of objects. Sharpness for the silhouette is a key element to concern. Lighting for these two photos shines from different angles. One comes from the side with a wonder feature and other comes from front. Angle of lighting is able to create a wonderful mood of a photo. The photos below show the powerful of lighting angle.
While I am in the world, I am the light of the world.(John 9:5)