Accurate Darth Vader Helmet as seen on Episode 7 The Force Awakens, vader Pyre, 3d modeled using Photogrametry , with accurate details size and shapes. For each project we spend a lot of time studying and compiling photo references we also use technologies and techniques like photogrammetry and 3d scanning to guarantee accuracy in dimensions, proportions and details. So our 3d models are very close to real props. check my process