Thank you for the feedback rom and maru! I agree with what you said, although tbh I didn't notice the pavement was too modern for the scene at first. I was somewhat bothered by the other things as well, so I'll try to make some refinements for the next renders (& probably edit the current one too.)
@Proh Thanks. The snow is 3d, using a particle system for the falling flakes, cscatter for sticking flakes, layered corona materials for frost/snow for details [crevices & intersecting geometry], and some geometry+displacement for the raised areas.
If you have any other questions or remarks feel free to mention. =]