Does penciling your eyebrows make eyebrow movement more pronounced?

That said, whatever your underlying physiology, having dark, distinct eyebrows visible from a great distance will make MORE visible whatever underlying muscle movements you personally are capable of (leaving out comparisons between you and anyone else). If your natural eyebrow hair, for example, doesn't extend all the way out to the edge of the area you can lift with your eyebrow muscles, then moving it won't show to anyone but a close conversational partner.

It's like the difference between a barefaced man smiling, a fully-bearded man smiling, and a man with a handlebar mustache smiling -- the handlebar mustache "cartoon-ifies" the expression and amplifies his muscle movements so it's visible farther away.