How to make Finland more realistic looking
Just a suggestion that maybe the roadside vegetation could be green instead of yellow. Would be already a massive improvement as the Finnish forests have very little yellow colour on the "forest floor" in the summer. One idea also how to make the forests seem more denser is maybe to add background pictures of a dense forest behind the current trees on the edge of the stages. Don't know if that's a possibility in Unreal Engine but if this would help with the more denser look on the Finnish forests without having performance issues.
You can check from this YT video how green the forest is at the Päijälä stage in real life vs the game. Also there is very little sky visible when looking to the woods since the forests are really dense so all you actually see is trees.
https://www.youtube.com/watch?v=T2ePBP9Pp2E