Chestnut tree high Poly

The tree comes with two LOD, one has 12,227 triangles, and one has 6,674 triangles. The lowest can go to 300 Triangles, but since this tree is for my personal project, so I did not make it. I used this tree in my Post-Apocalyptic World's scenes.
The bark texture is from Bridge, so do the leaves. I make the branch as well as the clusters myself. I attached the images to show you how I made the tree.
I made the branch first, then use the branch to make the cluster. Once the Cluster is ready, I build the whole tree base of it. That's why I am able to control the polygons.
If you have any suggestions, please let me know. I hope you will like it :)