How does Fyodor Dostoevsky use imagery in The Idiot?

Imagery:

"Tears, positively shone in his eyes towards the end, yet it was nothing but sentences without beginning or end, unexpected words and unexpected ideas, bursting out rapidly and unexpectedly and stumbling over one another."

"One of them was a short man about 27, with almost black curly hair and small, grey, fiery eyes. He had a broad and flat nose and high cheek bones. His thin lips were continually curved in an insolent, mocking and even malicious smile."