Sculpted in Sculptris, Rendered in Zbrush
This tree is another piece of a still developing digital sculpture, that will include The Mechanical Eve, seen here: [link]
You can view the original concept art for the tree here: [link]
I used the concept art as a general guideline only. Unlike other digital sculptures and 3D models I have built for this project, I allowed this one to mostly evolve on its own.