It’s your job to lead the viewer’s eye, and take them on a journey through your image. Rather than concentrating on details within the image, you should look for an overall visual impression of the movement and balance of the artwork.
Just like framing a scene using a camera, a useful technique is to create a frame – either digitally, or from card – and experiment moving it around your image. You can often be surprised by the varying effectiveness of the image depending on framing. In this example, the red area shows the primary area of dramatic focus, but you can see how the surrounding details are composed to lead the eye around the image and reinforce the primary area.