Something is bothering me about the size of the toilets compared to the washbasin. They seem too small...is everything to scale in this model?

i want to thank you all for your comments and i'm going to share the model so, me & others can learn and get some improvement advises thank you Solo for the idea here is the file http://www.4shared.com/file/PiRaP0q_/venecija.html?

Well it is a pretty good render, but I do not like the angle of the shot. Makes it a bit messy. You could try keeping the vertical lines more, eh... vertical . Besides that it is also good to put a image across from your building to get some reflection of the windows. Last but not least, try mimicking the sun instead of using GI for some nice shades...