Ah hey, considered doing the trees in Speedtree, keeping the same style ofc?
I did some of this stuff awhile back, but went for a more realistic approach, but still kept it looking Warcraft-y.
It's all in the light, the post processing, and the material shaders.
Consider some references; Stormwind in the VR trailer for the movie
Goldshire in the movie
Detailed art pieces.