Adding compositional objects on the edges of an image can help create a frame to keep the viewer's attention inside your image. Trees work well for this purpose. Fences, fence posts and other objects work as well. Here is an example:

The trees on either side of the snow capped mountain help to create a frame. The viewer's eyes will want to go through that gap to the background. There are many layers to this image. The foreground has grayish brush as layer one. Layer two is the grass. Layer three is formed by the framing trees. Layer four is made up of the second layer of trees further back. Layer five is created by the mountain. Such layers create depth leading the viewer into the image.

          The frame (trees on either side) helps guide the viewer into the image to the snow and prevents the viewer from straying off to the edges and from leaving the scene.

          How about framing your images?