Looks like you're using a marble and white metal texture on the ground. There's an actual snow texture. You should use that instead. Also, you should use some sun lighting for the outdoor areas. I thought the map was unlit in the first 2 shots. In the shot with the yellow lights, it looks like there's some brush misalignment on that corner. I can't tell for sure, but something looks weird about it. Make sure you stick to the grid. The wedge-shaped light on the corner looks weird as well. Maybe just make that corner metal or something.