The lighting for this image is a side light. We used a spotlight on the right hand side of the flowers and moved the camera a little back. By setting the lighting this way, it creates a dramatic mood. You can tell the main focus of this image is the flowers, the light brings them out, while at the same time creating a dark background.
The light is closer to 45 degrees from the camera than 90 which would be side light. the left side is darker but not dramatically so.