Designers are sharing their favorite tips for styling a polished living room, including bookshelf styling tricks and ways to fill a space with art. However, the specific advice varies, with some outlets reporting on the use of houseplants, holiday decorating, and southern decorating tips, while others mention rules like the "red thread" rule or the 3:3 rule for organised shelves. It appears that designers have multiple approaches to achieving a cohesive and stylish living room.