Unlike Twilight Starlit can't let appear mustaches with magic. So she draws them XD
We share the same bad habit... adding mustaches to things. You should see my sketches with mustaches.
Maybe I'll make a sketchdump mustache edition one day XD
And seriously... that mustache trick is one of the most awesome tricks Twilight can do. I'm sure Starlit is secretly jealous that she can't do it XD