Here’s a detail on the skull showing the redesigned headphones, and is pretty much exactly what I had envisioned from the start.  There’s a distinct 70s, mechanical quality to these ‘phones that I believe just goes perfectly with the rest of the scene.  In fact, they bear a scary resemblance to these quadraphonic headphones that I found in my closet (I must have taken these from Dad at some point, but could never use them without a quad decoder and actual quad sources!)  The next version should see the return of the materials mock-up, but for now a line art-only version is necessary to confirm that the design works.  The earmuffs are officially gone!