There is an almost expressionistic quality to Robert Louis Stevenson's descriptions of the setting and characters in The Strange Case of Dr. Jekyll and Mr. Hyde.
For example, Hyde is often associated with darkness and the night. He appears in nighttime scenes (such as when he murders Sir Danvers Carew in the dark of the night), linking him with danger and mystery. He is generally depicted as pallid and gross, inspiring disgust in everyone who comes across him:
Mr. Hyde was pale and dwarfish, he gave an impression of deformity without any nameable malformation, he had a displeasing smile, he had borne himself to the lawyer with a sort of murderous mixture of timidity and boldness, and he spoke with a husky, whispering and somewhat broken voice; all these were points against him, but not all of these together could explain the hitherto unknown disgust, loathing and fear with which Mr. Utterson regarded him.
Stevenson never gives a specific description of Hyde's appearance. Instead, he hints at his grotesqueness, because this creates a stronger impression within the mind of the reader, who will project their own ideas of revulsion and ugliness onto what little details Stevenson provides. His pale complexion suggests sickness, and his leering smile suggests a sadistic and predatory nature.
Another character who gets an evocative sketch as his main description is Utterson, the lawyer. He is presented as a mild, slightly dull, but overall patient man through small details, such as the way his eyes look at a party or how he is often bewildered by the high passions of other people. Small details such as this say a lot about Utterson without going into too great a detail about the matter.