You have a great base, but some of the shadows seem to be off. They are all going in a single direction instead of their shadows being away from any light sources. It's more obvious on the boxes near the south chandelier and the pillars.

If you are using CC3+ I dont have mcuh advice as I'm still learning to use it myself, but you could use GIMP or PS and draw the shadows in yourself if you can't get CC3+ to display them correctly.

Looks great though and I look forward to future updates!