a 'sharp' image/picture/photograph [=an image/picture/photograph in which the small details can be clearly seen]
a 'sharp' break from tradition [=a sudden change from the traditional way of doing things]
A 'sharp-eyed' [='perceptive'] reader will notice the book's repeating themes.
(..) The color of this shirt I don't know what it's doing to your eyes, but I like it. - All right, listen. You gotta be on your toes tonight, okay? This chick's a lawyer. She's gonna be pretty sharp. Stick to the game plan, okay? She's a lawyer. I like that. He's sweating through his shirt, dude. (..)2009 TvShow: It's Always Sunny in Philadelphia Title: The Waitress Is Getting Married Season: 5 Episode 5