Now bear in mind I am no render magician like some others on the forum :) But here are my thoughts
What lighting set up do you have? I'd be going for just Corona sun and sky.
I think the trees look good here though, which perhaps points to texturing being a large part of the look of the other objects rather than the lighting being a problem. The walls, roofs, pathway and grass in particular look fairly flat and even in colour, whereas the trees have lots of detail to them so look good.
Some pronounced tiling on the roofs would be good, the pathway by the road could use either slabs or some variation in colour to give it some texture, the grass could have more of a bump (or at least a stronger variation in the colours that it has), the walls of the houses might be ok with those other changes, though some variation in colour there might be good, a bit of noise or bump.
I also think the pathways have edges that are too straight and prounced, same with the river (and there are some polygon edges visible back there where it curves). A bit of displacement or just modeling in some variation to the river bank would be good, some smoothing with opensubdiv or turbosmooth for the river banks. For the path edges, either some slight scattered objects for stray grass blades (could even be just planes with a transparency map rather than full geometry) - anything that would give a rougher edge there, something a little less "CGI perfect"
Same with the hedges too now I look, they look a bit too smooth and even.
Hope something here helps!
Just my thoughts on it!