A good portrait is a picture that can tell a story.

A good portrait also evokes emotion.

A good portrait tells us something about the person in the image.

Background is a significant element.

Angles matter in portraits.

It is good to have a story being told in the picture.

Its good to evoke a mood or feelings in a photo.

It is also good to have the subject asymmetrical to leave space for the background to leave more to look at.

It is good to have background but not to much background cause then the viewer will not pay attention to the main subject.

In some cases high angles make portraits better but not all the time.