She underlines the Slytherin connection, which enhances Lord Voldemorts mys-tique; I think he is perhaps as fond of her as he can be of anything; he certainly likes to keep her close, and he seems to have an un-usual amount of control over her, even for a Parselmouth.
"I won’t say a word, sir," said Riddle, and he left, but not before Harry had glimpsed his face, which was full of that same wild hap-piness it had worn when he had first found out that he was a wiz-ard, the sort of happiness that did not enhance his handsome features, but made them, somehow, less human…… "Thank you, Harry," said Dumbledore quietly.
There are no more uses of "enhance" in the book.
Show samples from other sources
This sauce will enhance the flavor of the meat.
The stunning victory over the Blue Devils enhanced the Bulldogs’ image as title contenders.