my second post,not much about 3dstuff mixed with photoshop
thanks for the further comment…it will help me a lot…
You may to improve the roof tiles ( modelling it!! 
)
The image is so sharp, blur it.
Is a good image for a beginner, kepp this way
i think yer relying too much on images, rather than making your own 3d content, i simply detest the fake people but thats just me.
The image actually looks pretty good in my opionion.
If possible, I suggest you moving the position of the sun, so that the building can cast enough shadows on one side, which can well balance and enrich the whole image. Lacking enough shadows and middle range of shading, is another reason why the image looks too sharp.
i got only a day to finish it (it has only free hand sketch) so i havn’t time to spend too much time at modeling,for the roof things…about lighting
i will keep in mind thanks…