add more wind effect, more noticeable grass moving, trees and bushes moving and more particles through the air, like in Hirschfelden.
Some DLC maps feel like a different planet, too static and lifeless. Even in New England, which has beautiful colors, the trees and bushes are motionless, grass moving is barely noticeable. And with the amount of dead leaves covering the ground, adding falling leaves - like in Hirsch - would add to the immersion.