Tree For Game using ZBrush – YouTube
I moved onto modelling the main tree into Zbrush, and watched the above mentioned tutorial on YT to gather information on how to do it.
I found using ZSpheres a lot more comfortable than building it up form a cylinder using Clay Buildup. This technique helped me gain a lot more control of the shaping of the tree branches and roots, and allowed me to really customise it to fit my desired design.
Once I started to actually sculpt it, I found that using the Trim Dynamic brush really helped create the bark-like texture I aimed the tree to have. I am planning to add squirrel holes and more intricate texture details, and to attach the body of the house (as well as the other tree) to this initial sculpture.