To allow better flow around the room, I suggest moving the credenza to the wall by the closet. This will give more space when opening the closet doors and create a storage area instead of a seating area. I wanted to make the wall behind the desk a big focal point so I suggest a pair of bookcases with framed art in the middle. This will make a big statement in the room. Mount the picture ledges on the wall just to the left of the door. For the extra seating, I suggest having accent chairs facing the desk. These are small chairs so 2 work here or just 1 if you want more space.

This rug is one of the options for your work office I presented earlier. I love the color and pattern in it and it could make a big statement in the room. I replaced the ceiling fan with this modern black pendant. Every room needs a pop of black and this is a great spot. The bookcases are actually from Crate & Barrel and are in the same collection as your desk.

Practical and functional chair in a sleek black to pair with the ceiling light.

A casual chair in a light color to take up less visual space in the room.

Theses bookcases will be a great place to store books and your favorite odds and ends.

This option has a warmer color scheme with lighter accent colors. The light has a fun pattern and is around the same size as the black pendant from option 1.

This chair is a very comfortable, yet formal, option.

This acrylic chair is a nice modern contrast against the upholstered chair.

These bookcases are a great way to add height to the room.