Florence in Winter (Archviz)

So I wasn’t sure where else to post this because it is more of a newbie-getting-the-hang-of-UE4 than anything as this is my first project; I’m going for an Archviz concept as seen in the image below (basic Blender render) & I am honestly struggling transferring my rendering knowledge to the UE4 UI. Having said that; I have spent a few hours attempting to build the basic layout and apply some basic materials/lighting with some unwanted artifacts appearing. I will sally forth and continue building, playing with fixes and using the answers-hub; any other thoughts greatly appreciated as I continue this project!



Current progress (any hints about the light artifacts I’m getting?)