"Snowy" the Snowy Owl is on their back partially wrapped in a white towel looking up at camera with eyes bright yellow + slightly crossed. The half-open mouth on Snowy, or on any beaked animal for that matter, kind of makes it look like they're smiling - due to the consummate V's of the upper and lower beak forming a happy arrowhead shape "⮟". The reality of course is Snowy is likely very agitated, vocal, and causing a scene. Such is wildlife work. Snowy's feathers are white, save for some bow-shaped bars across the chest, as if someone tried drawing roof tiles with a black pen. If I'm not mistaken these marking indicate Snowy is female. Snowy also has very thick white 'moustache' of rictal bristles, which as the original caption says adds to a look of "adorable fierceness!"