TOTALLY RADICAL, DUDE!! I never knew Strongheart would turn out so cute as a human. I love this kind of facial expressions (You know, that face you make when you see something weird or awkward like Pinkie Pie chewing on a rubber chicken?).
As a rule of thumb in the series, if it has eyelashes, it's a girl - and if not, it's a boy. The only major exceptions I can think of at the moment are Zecora (girl, but no eyelashes) and Owlowiscious (boy, but with eyelashes).