a concept rendering I did for the cover of Pinicle Magazines Fall edition. 
Thats a very nice picture you’ve got there. Its a pity that the quality is a little inconsistent for instance the lighting and texturing on the part of the house over the garage looks very good yet pther parts like the leaves of the trees behind the house look dull and, in places, untextured, or at least like they are a solid block of green.
I think you could improve this by changing or tweaking the concrete, pavement, road and garage textures ( i love the textures you used for the house’s stone work). You could also bevel some things that look like they are sharp edges like the pillars in frount of the door.
To make the trees and some of the lighting more interesting you could use soem very soft spotlights, to light up or negative ones to darken the image in places.
And as a final crit i dont really liek the roof tile material.
Well done though on getting onto the cover of a magazine!