The Punisher #4

Frank Castle sits astride a motorcycle in a grim industrial space, dual pistols raised and ready — Tim Bradstreet's cover work giving the Punisher a weathered, almost photorealistic menace that perfectly suits the Marvel Knights tone. Part of Garth Ennis and Steve Dillon's celebrated run, issue #4 carries the story title "Dirty Work," which feels entirely at home with the no-nonsense threat radiating from that cold, scarred face. If you're following this series, this cover alone makes a strong case for keeping up.