It's a real b*$!@ to color with a mouse.
Refer any horse anatomy complaints to K-nattoh (not that I'm any better).
Can someone teach me how to do pony faces? K-nattoh does a squiggle and a nostril but it didn't work for the way I colored it.
Her wiggly mouth look like she is wearing lipstick and I don't know how I feel about that.

And of course a reference towards the original sketch by "Okay, NATO.": >>2551541:https://derpibooru.org/images/2551541