Mate I'm glad to see in the last images you turned the cars lights off, couldn't quite understand why they were on in the night shots.
I like your images though I can see some of the brick / stone work is suffering from bad tiling.
I think it might be worth reducing the saturation of your greenery particularly in the night shots, you could even add a blue evening filter to these!
I think you could also add a bit more variation to your path side small shrubs and dirty up the grass a bit generally!
Please also I'm not putting down the quality of your work but heck we can all improve. In fact I'll post a few of my own renders straight away and look for your suggestions!
Cheers mate! Richard