Which technique is the author using in this passage to reveal character traits

I think the complete question would be;

Which technique is the author using in this passage to reveal the character’s traits?

passage from the grapes of wrath muley’s face was smooth and unwrinkled, but it wore the hateful look of a bad child. the mouth was held tight and small, the little eyes half scowling, half fretful.

is:

the Imagery used in describing the details about the face, and the metaphor used in comparing it to a child's face. These details tell the reader about the character's personality.

a caption indicating the purpose of the diagram

explanation:

hey wanna : ) ; )