How does Virginia Hamilton use imagery in Bluish?

Examples of Imagery:

"Natalie is this girl's name. But that's not what kids call her. Call her Bluish and grin and look at hard. Bluish fits her. This girl is like moonlight. So pale you see the blue veins all over. You can tell though, once she had some color."

"Kids left their seats. Slowly, they came up to the front; Ms. Baker was the lamplight they were drawn to like moths. Hearing her talk about Bluish made them stop and think about this worry they'd been having. And now they could show it, they could let it out."