Crooks

"his eyes lay deep in his head, and because of their depth seemed to glitter with intensity."

The light sounding verb "glitter" and the assonance it creates with the abstract noun"intensity" combine to create a vivid image of light within the darkness.

"His lean face was lined with deep black wrinkles"

The repetition of the adjective "deep" to describe both his eyes and wrinkles enhances the connotations of wisdom and profound thought.

In this way, Crooks' appearance is representative of one of Steinbeck's main overall points he makes in 'Of Mice and Men': that, as well as living a tough physical existence, these seemingly simple manual labourers also suffered extreme emotional turmoil and had just a small but intense "glitter" of hope in the form of their dreams.

Furthermore,

The description of Crooks' face reflects his suffering but also suggests he has hidden depths as...