Why is considering the background crucial when shooting portraits?

Considering the background is crucial when shooting portraits primarily because a distracting background can take attention away from the subject. In portrait photography, the main focus should ideally be on the individual being captured. If the background is cluttered or overly complex, it can compete with the subject for the viewer's attention, thereby diminishing the impact of the portrait.

A clean or complementary background helps to isolate the subject and allows the viewer to engage more fully with the person in the photograph. This makes it easier to convey emotions or the narrative intended in the portrait. The choice of background should aid in enhancing the subject, helping to tell their story rather than distract from it.

Other statements present different perspectives that do not align with the key principle of maintaining focus on the subject in portrait photography. While a busy background might sometimes enhance a subject or colors could be harmonious, the primary consideration should always be that the subject stands out clearly and effectively.