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.
(..) from the man who did the waking. Aye, that'll about do it. Blast! I'm already awake! That was for the smell. Keep a sharp eye. Now, what's the nature of this venture of yourn? I'm going after the Black Pearl. I know where it's going to be, and I'm gonna take it. (..)2003 Pirates of the Caribbean: The Curse of the Black Pearl
(..) May I have a moment? You look lovely, Elizabeth. I apologize if I seem forward, but I must speak my mind. This promotion throws into sharp relief that which I have not yet achieved. A marriage to a fine woman. You have become a fine woman, Elizabeth. (..)2003 Pirates of the Caribbean: The Curse of the Black Pearl