The white closet thing needs more detail.
You need to add shadows under the desks and chairs for more realism.
Add more details to the walls.
Make the windows more transparent and look like there's an actual sky behind it.
Frame the pictures on the walls.
Make the screen of the monitors darker than the frame of the monitor.
Add bases to the bottom of the walls to give a realistic look.
Frame the windows.
Keep working on it
