How does Robert A. Heinlein use imagery in The Moon Is a Harsh Mistress?

Imagery:

"She waited, big smile on face and body undulating, while I applauded. Before I was done, two little boys flanked me and added shrill endorsements, along with clog steps. So I tipped them and told them to be missing; Wyoming flowed to me and took my arm. 'Is it okay? Will I pass?'
'Wyoh, you look like slot-machine Sheila waiting for action.'