I'm sorry, but your photos only show your furniture, not the room. That makes it difficult for me to suggest furniture positioning. When I'm positioning furniture I start by measuring the room. Then I draw a FLOOR PLAN to a scale of 1 foot equals 1 inch. Draw in any doors and the direction they swing. You won't be able to put anything in the way of a door.

If you don't have clients visit you in your office, it doesn't matter where you put the desk or couch. If you do it's more important to have your chair facing the doorway, and chairs are better than a couch.

@mindshift thanks, no clients come to the office. I'm not worried about the positioning of the furniture but moreso what I can do to spruce up the decorations. I was thinking of a small plant on the desk, possibly an area rug with a pattern under the desk/chair.

@groveraxle I was thinking IKEA or Target but I know most of their floating shelves are particle board with veneer.

Hire a carpenter or handyman to build them for you if you don't have the right tools.

DIY Floating Shelves - The Home Depot · More Info

Why not consider going in a different direction? This is a book wall tower.