Some tips:
Modelling from real world dimensions always adds realism; under the scene tab you can set Blenders units to Imperial or Metric rather than the arbitrary blender units.
Whatever material you are trying to make look up references for that specific material (walls flooring, roofs, etc.). It looks like you just pasted a wood floor material. Andrew Price has an excellent tutorial for realistic textures in Blender (assuming you are using cycles).
Think about who will (co)habitate and what items they will bring in, what items they'd need for comfort, etc.
For lighting always use HDRI maps; right now it looks like you're using the integrated skymap for Blender which won't give you the realism you are striving for. Also during a daytime scene never use artificial light.
Add more "passive" items and furnishings; things you wouldn't look twice at in your own home but you'd notice if they were gone: tables, chairs, bookshelf, lamp, etc.
Make it look more alive: add opened books, glasses, plates, etc. And don't be afraid to use pre-made/3rd party models; all the pros do!
Don't try to make your raw render you're final image; post-processing in Photoshop or Gimp is always good.
Also for compositions/camera; try not to rotate the camera up or down, a straight lens looks best!