For this update I replaced the trees with a more polished stylized version, my workflow consisted in using the MTree addon from blender to create the trunk shape and canopy, then sculpting the trunk detail in zbrush, and then baking and texturing in substance painter using a procedural workflow to be able to save it as a smart material and quickly texture the other trees. Similar workflow for the cactus, then for the leaves and shrubs I used substance designer for the texture and a normal edit modifier in blender to get the normals from a sphere and get that final shading effect in unreal.
Next I'll focus on the ground and rock textures.
