Be the picture of health, guilt, misery, etc.
Definition 1 of 2

Visual Metaphor
The phrase often creates a strong visual impression of someone's condition.

He walked in, the picture of misery, after losing his job.
Not Literal
It's not about an actual picture, but how vividly someone represents a condition.

On her wedding day, she was the picture of happiness.
Emotional States
Commonly used to describe obvious emotional states that are 'seen' on the person.

At the verdict, the defendant was the picture of guilt.
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