If you want to create a magical elven forest, experiment with different tree types and effects. The editor has beautiful effects for decorating forests. If there's a hill in the center of the forest, it will look even better. + Add bushes, grass, stumps, fallen logs, mushrooms, etc. to the trees to make everything look cohesive.
It's a magical forest, so what kind of stumps? Stumps grow into Ents there. There are already plenty of mushrooms and grass. Oh well, I'll add some more.