Thank for your comments, i darkened the BG a bit to remove the redish feeling of the pic.
Btw, i've just finished a clip for this mansion and wanna share with you all. http://www.youtube.com/watch?v=by8gOyvo5xI
Thnx for comment. The project is still a W.I.P and we didn't come to final phase, just wanna try out what i can do.
When i finished with the final version i'll upload it here.
Good work! I think using the same camera angle that you did for the daytime scene would've made for a better nighttime render. I think the 3D people make the scene lose some realism as well. Go with clipmapped or photoshop in images of real people instead.