For many photographers, the first mistake they make in composition is trying to fill the picture frame. I’m guilty of this myself, particularly with wildlife photography. There’s the big lens theory that you need to get a big fat piece of glass on the front of the camera so that you can fill that sensor with the leopard in a tree. For landscape photographers there’s the opposite - little lens theory - that you get as wide a lens as possible so that you can fill the frame with as much of the landscape as possible. Then with all these wonderful big and small lenses we wonder why our images look dull and uninspired. It’s because filling the frame is not necessarily the best way to create a meaningful image. Sometimes, you need to leave it empty.