Set dressings are important. Even neat people will have some clutter. Papers or notebooks on that shelf in the desk. Stuff on top of the credenza. Post it notes, etc on the desk. It's all the small touches.
It's like when you watch a TV show with bad set dressing and you can just tell by looking at it that it's a set, that nobody lives there because it doesn't look lived in.
Your set is too sparse. It doesn't look lived in. Dress it up a bit more.