Answer: Proportion provides depth, realistic imagery, definition for the individual parts. Why were portraits important in early history? ... Before photography and film, portraits provided a way to record a person's image. Rembrandt's self-portrait, or portrait of the painter himself, is a painting.
Portraits were important in early history because if we had found those paintings and pictures we can determine what there life back then was and what materials they had in the past then what higher materials we have now.
"Spirit Resonance," or vitality. This translates to the nervous energy transmitted from the artist into the work. As in, the overall energy of the artwork itself. Xie He said that, without Spirit Resonance, there was no need to look further.