^Agreed. The animators have really advanced to a new level after all these years. I watched a couple S1 episodes the other day, it’s incredibly noticeable.
I love how realistic this looks. I mean, obviously not “realistic” in a photorealistic sense, but the expression is bang on for how someone would look holding a pencil in their mouth and concentrating like this. I made a note of it in my head when I saw it yesterday, and I was hoping someone would snag the screenshot.