yeah looking nice. Maybe some of the specular highlights could be removed I mean those which show in cracks.
Anyway here is what I got from the basic shader
pretty much same result as in sc2 engine I think. Still need to tweak the spec a bit but I must confirm that the spec and transparency work as it was described. Pure black is transparent and everything else is a spec value. Also I am using tif format because tga alpha is not working for spec for some reason.
and sorry I forgot to give you tree normals, here they are