This was really important to get right, needed the second character (right) to work with the first characters rig.
Including the facial rig, the proportions being similar is intentional.
One thing that might not be obvious are the loops in the face, particularly the ones that run from the edge of the nose to around the sides of the mouth.
I thought the one on the left was correct when I made this then realised it was completely off, this was corrected on the second charater and well I'm pleased with how well the blend shapes hold up.
Shout out to the very talented Eugene who modeled the character on the right (the reason the quality difference is so large).