A good bartender is more than just the drinks he serves hes a guy you want to drink em with. Like Ron Johnson, on the second floor of Northern Liberties watershed Standard Tap. Hes mixing cocktails for the ladies, cheerfully pouring local drafts for the friends who met over MySpace, regaling the nouveaux bohemians assembled at the mahogany. And sometimes, youll find him there on off nights. On a totally dead one not long ago, Johnson a Pennsylvania Academy of the Fine Arts grad, and a sometimes professional painter by day whipped out the ink wash and brushes hes known to keep behind the bar and painted tiny masterpieces on customers coasters.