The rendering looks good, but at that photoreal level it all comes down to the detail level of the modeling. Your furniture looks a little strange - how does that coffee table stay upright with just 2 legs? Why is that tall-backed chair so thin and seated so low? What's with the super-thick electrical cord?
What you want at this point is detail, detail, detail. Chamfer everything,
don't leave a hard edge anywhere. Make cylinders and tubes have an insanely high segment count. Model every little plastic seam and gap on the PC screen and the table.
Add small, nearly unnoticeable detail, stuff that you usually see in photographs: books and papers just barely visible on the rack, post-it notes on the desk, electrical cords coming out of the plugs on the wall, leaves of indoor plants poking out of the edge of the image, etc. etc. Once you get convincing enough furniture and props, real-looking renderings come automatically!