Hello!

Very nice rendering with a convincing look!
It's a promising wip :)
If I may give you a little tip...when you will do the final renderings, put them into a real world scenario.
The overall result will be very nice.
I don't know what kind of software you're using, but I know that, for blending 3D scenario into real world, Blender 2.79 is a great product, with a very good Shadow catcher and Image composition module.
You Can find tons of tutorial about that.
But, also a software like Affinity Photo (or Photoshop) can be a very good alternative, if you are familiar with "2d Image composition".

Have a nice day.