Rodrigo,
Nice tree. A fine diorama!
Wire trees are extremely authentic. You can really represent roots. If one stands close to the trunk of a tree and looks up, one can see that most trees grow in a twisting motion. I can post some photos with examples if anyone would like.
I am not a fan of bare lichen foliage though. It has a place although I think it is too thick to represent branches, and completely lacks any leaf detail. If one sprinkles a leaf product onto lichen it can look great.
Thanks for showing us how you make your tree.