When faced with a large room, break your seating arrangements into several clusters. This will create separate sections in the room, making it more intimate and usable. Don't try to balance everything off the fireplace or windows. LOVE the windows!
Simple white bookshelves This living room nails my three key elements for a great space: tons of natural light; a perfect mix of pattern, texture, and style; and a focal point of shelves that display books, art and personal mementos.