Really great job! You could easily pass this off as a photo. It does seem like the prices and listings would be on both sides and I think that maybe there should be more stuff in the displays. These are just my opinions. You are very skilled.
Usually for things like that I use a decal (product display.
For lighting I first finish modelling my scene, then remove all the other interior elements (as in your case the cabinets, rugs etc and eaving only the walls, I set the lights and hit render at the highest settings. The renders much faster. When I am satisfied with the output I add all the other interior elements, hit the render buttom and go to bed. The next morning my work is ready.