Possible Clues:

• Diminished golf shot, perhaps
• Lost youth went off line
• That's got to be just a shade less
• No longer sharp
• Lost freshness or colour
• Lost freshness or brilliance
• Vivid no more
• Slowly disappeared like Prospero's pageant
• Not so bright anymore
• “She was a ____ but still lovely woman of twenty-seven” (F Scott Fitzgerald, in “a line which certain people will not let me forget”)