How does Virginia Hamilton use imagery in The House of Dies Drear?

Imagery:

"And framed by the night stood that massive, black and bearded man some souls called Pluto."

"Soundlessly the mirror closed. Whatever stood there in front of it gave back no reflection in the totally dark house."

"They had to walk down a wet, slippery ramp of chalk-white limestone, with enormous stalactites hanging just above their heads."