http://koerner18.com/resources/_wsb_329x360_Fassade_2007-4_DSC_0002.jpgif you look closely at the windows, every window is a little different. some have curtains, others don't. some are closed, others aren't. Some have shutters half-opened, some have them fully closed.
More detail would not be bad if you plan on making the character come close.
Definately add a normalmap to the wall. It may not be perfect, but it adds structure. you could do bricks, or otherwise simply a noise or something. the latter could be achieved with a good texture as well.
Now... that being said: the critique would be much better if there was more. maybe build 10 houses, and then aks for city-critique. this way, you'll just get house-critique (do you know what I mean? A single house should be more detailed, for an entire city, this may just do fine)
It is a good house. the architecture'S nice, it just needs more.
well done,
micha