Apologies for the length of the video, It's more of a process rather than a tutorial. If you follow every steps correctly you will be able to create a stunning night exterior scene. Here are all the textures and models to practice: https://mega.nz/folder/LIMWXJCQ#oUxHSQydOO5KcnSv2oDSCw
V-ray Blend Material Tutorial: https://www.youtube.com/watch?v=hGrPe_oSpRE
Realistic grass tutorial: https://www.youtube.com/watch?v=qGlHDVGDYSY