Many thanks for the comments xv43, I have added drop shadows to the furniture etc and thickened the grid - you are right it looks loads better. I haven't managed to shadow the bar as it is on a different layer (and I cant work out how to move it!) I will post the top floor when I am happy with it.
Thanks for the link Redrobes - Vrys map is pretty awe inspiring, it will need one hell of a tutorial to get me to that stage using CC3
btw, this is also the first time I have joined a discussion group too. I am off to seek the tutorials (or maybe go to bed!).