This is a great book—especially for the the obsessive and/or anxious writer. It has a 14-page questionnaire intended to help you to really understand your character, so thoroughly that you just know how s/he would behave in any given scene. Then there are chapters on everything from Face and Body to names from around the world.
So why not just stop with an endorsement? What more is there to say? Just a few things about making characters vivid and memorable.
Actually, I can’t quite imagine eyes like butterflies. Nevertheless, this book highlights two methods of ramping up characterizations: similes and metaphors. Essentially, saying a character is like something, it’s a simile. E.g., “Her smile was like sunshine.” Saying a character is/was something is a metaphor. “He was a rock when Mother died.” As in all writing, avoid the clichés. “She is a diamond in the rough” is a tired example.
So where does one look for fresh ideas? Consciously visualizing a character in non-human terms might help.
What animal would X be? Consider the differing implications of spider, rat, rabbit, toy poodle, wren, cow, mule, pig, chicken, etc., etc., etc. Various animals are associated with specific personalities and actions, and labeling a character that way can convey a lot of meaning. Think lap dog.
What is X’s astrological sign? Whether one believes in astrology or not, various signs carry lots of implications. The title Men Are From Mars, Women Are From Venus works on many levels: Mars is the god of war, Venus is the goddess of love, and the planets are millions of miles apart. The Chinese sign one was born under has similar implications. I was born in the year of the Cock, and apart from the personality implications, this should be a very good year for me!
What stone would X be? Again, some stones carry a lot of weight already. For example, diamonds are hard, bright, glittery, and expensive. What characteristics do you associate with pearls, emeralds, jasper, agate? What about abalone? Quartz? Cubic zirconia? And what about metals? Is X gold, silver, platinum, aluminum, iron, brass, bronze—or maybe mixed metals?
What plant would X be? What are the associations with oak tree vs. lily? Rose vs. dandelion? Wheat vs. redwood? I won’t belabor the point. You get the idea.
Bottom line: Characterize characters in unexpected ways. You could come up with this sort of writing.