How does C. S. Lewis use imagery in The Magician's Nephew?

Imagery:

"But what she noticed first was a bright red wooden tray with a number of rings on it. They were in pairs - a yellow one and a green one together, than a little space, and then another yellow one and another green one. They were no bigger than ordinary rings, and no one could help noticing them because they were so bright."

"The last figure of all was the most interesting - a woman even more richly dressed than the others, very tall (but every figure in that room was taller than the people of our world), with a look of such fierceness and pride that it took your breath away. Yet she was beautiful too."