The tree was made inside zbrush using zsphere and zsketch. A really good workflow and I might come up with the way I did it in few days.
those stairs were a little bit difficult to bake on a plane so I decided to use topogun.
Zbrush still has some flow for game artist like the fact you can't bake normal map from different models.
but still I'm really please by the result. I may keep working on little stuff for a while just to get a really good understanding on what can or cannot do within zbrush.