“She's as fierce as a tiger” is a simile, but “She's a tiger when she's angry” is a metaphor.
What do you think of the author's use of simile?
But Dickens finds the unexpected detail, the vivid simile. Think of Joe Gargery in Great Expectations, “with eyes of such a very undecided blue that they seemed to have somehow got mixed with their own whites.” Or, in David Copperfield, Dora's cousin “in the Life-Guards, with such long legs that he looked like the afternoon shadow of somebody else.” —James Wood, New Republic, 14 Dec. 1998
After the internship year, doctors assume greater responsibility for directing patient care. Dr. Shockcor at West Virginia offered a homely simile: “It's like working in a factory, putting doors on cars. I'm now responsible that the doors get put on right, whereas as an intern I had to make sure I had a door in my hands and didn't miss a car going by.” —Michael Harwood, New York Times Magazine, 3 June1984