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.
(..) Come on ! l'm sorry, l dropped the keys ! Wait ! Please ! Don't leave ! Please ! Get more help ! l got 'em ! Which one is it, Rose ? The sharp one, try the sharp one. Hurry, Jack. Oh, no ! Hurry, Jack. lt's stuck ! Hurry, Jack ! (..)1997 Titanic
(..) What's this luggage doing here ? Get rid of it ! We need the room ! (crewman giving orders) Keep calm ! Move along there. Make more room. That's right. Look sharp. - Lovejoy ! - She's not on the starboard side. We're running out of time and this martinet isn't letting any men on. (..)1997 Titanic