Me and @VECTOR have been furiously modelling away recently inspired by a help request in the new users forum, in which someone had downloaded a hideous mesh, full of terrible triangles, so we thought it would be fun to model Vader's helmet properly out of quads. This will take an hour, we thought.
3 days later, we were still going. I had opted to do a 2-piece mask, circa Return of the Jedi, whereas Vector went full-on rage mode, doing the 3-piece prop mask, including internals, from Revenge of the Sith.
Modelling-wise, it's been a challenge, and I am still not 100% about all my edge flows, even though it's 100% quads, but I am mostly happy. I have 1 complex pole remaining, but will eliminate that eventually. In the meantime, here's a couple of renders and wires from me, which we can compare and contrast with Vector's more detailed version, which'll be along this afternoon :)
CBR