The first thing we do when digitally sculpting an action figure is to block in the essentials as quickly as possible. This is done by creating different low-res polygon proxy models that we'll either replace or refine as the work progresses. Along with this, we'll use simple geometry like spheres and cylinders to set up all of the figure’s articulation as it progresses. (And yes, we know. We hated geometry in high school as much as you did--but consider it proof that even the dryest subjects can be used for something really fun!)
Once the model has some definition to it, we use masks and textures to create the final surface and add the finishing touches. Most importantly, there is never a single technique when it comes to digital sculpting. We're always exploring new ways of solving different artistic and technical challenges. This is fairly new technology and the rules are still being set. We haven't even begun to scratch its creative surface.