Thanks everyone for the feedback. It's been a long day at work, so I haven't been able to reply.
Shadows - I realized right away I left those off and have already fixed those.
Symmetry - Yes, intentional, it is a wealthy house and the symmetry was to help show neatness, order, etc. I might play around with it and see how else it could be shown, or perhaps do more around it to play up the symmetry even more (like in the link shown).
Rock pool - In my world decorative pools edged with rocks are very common. This is not supposed to be a naturally occurring pond. You can google "koi ponds" and look at images to see what I am talking about. I am hoping to find some fish I can have swimming around in it to give that effect.
(And I hope I don't sound defensive, just trying to explain my thought process behind it. I do appreciate the suggestions and I will tinker with it to improve it.)
@gmork - Looks good from what I can see, it's pretty dark, at least on my monitor.
@Sloth - It's interesting. I can't quite tell what's going on underneath the platform with the pillars (I think) and the blue swirly stuff.