A little breakdown about the Big Tree (Zelkova Serrata or Japanese Elm). The tree was made in SpeedTree and animated in UE5.3 with IGToolsPP plugin. I've started in ST with 4 trunks and different splits, then exported and used it as a base for a custom sculpt in zBrush.
I did the UVs using RizomUV because it's very good when dealing with hi-poly meshes. Once the base was ready, I've textured it in Substance Painter. I've imported the trunk and the textures in ST and used the "bake stiches" feature to connect the trunk with the procedural branches. As the trunk is very deformed, a few manual corrections were needed; for those corrections I've used a mix of Blender and Maya.
IGToolsPP is a plugin to import SpeedTree models in UE5 as vertex animated nanite static meshes (Pivot Painter 2).
The plugin is available at https://artstn.co/m/RpPpN and at https://www.unrealengine.com/marketplace/en-US/product/igtoolspp-speedtree-to-pivot-painter-2
Docs https://inu-games.com/igtoolspp-documentation/
Movie: "Japanese Garden that will melt your GPU", rendered in UE5.3