Photographers, as most graphic artists, have many tools at their fingertips to guide viewers to specific aspects of an image. For me one of the strongest is the crop, a decision on the dimensions and perspective an image will have in its final state. Combined with design elements in the image itself, the crop can elicit an almost involuntary reaction in viewers. They have to look where you direct, at least first, and linger where you want. After the subject, the crop may be the most memorable aspect of a photograph.
Here are some examples of extreme crops made to complement the subject matter made to give you little license on where to look!