I wouldn't agree that it's mostly a lighting at fault here. While obviously the lighting can be improved, but fundamentaly you can only make it more artistically pleasing, but not more realistic. Actually it's pretty hard to make unrealistic exterior lighting in modern renderers, unless you'll do some stupid things, like start placing lights in the sky.
What i find wrong in your render, is 1. models, 2. materials, 3. texturing, 4. tonemapping. Not in a particular order. I don't have time to go into details, but i'll try to give you some key points aboutneach area.
1. models are too simple and lack of details. All corners are unrealisticly sharp, edges are too perfectly straight, there's zero randomness in placement. Everything's flat, straight and sharp.
2. materials are too simple and unrealistic. It looks like everything except for glass and carpaint, has the same plain roughness value. It looks like you applied the same material to everything and just swapped diffuse and bump maps. Cars looks particularly bad - is that automatic conversion from Vray, or scanline?
3. Where's dirt, weathering, stains, imperfections? The house has been built on conveyor belt 5 seconds ago?
4. the image looks too flat and uninteresting, everything has about the same brightness level, there's nowhere to rest an eye. Nothing catches viewers attention for longer than couple seconds.