In the show Pinkie gets curls in her hair as an expression of her exuberance, but this picture changes the idea and it speaks to Pinkie and Fluttershy's friendship. Pinkie talks, and talks and talks and talks. Fluttershy listens. The two spend time together with Pinkie expressing herself vocally while Fluttershy busies herself by adding some fluff to pinkie's mane. Pinkie goes goes on and so does Fluttershy until every last hair is curled.

For me this piece strikes a chord as it's a similar dynamic I have with my own friends.