The description on the satyr king card says fuzzy lower legs, and jeweled horns and eyes. I'd say stay away from faceted things on your face and horns, and make sure your costuming includes something to rep fur on your torso and arms, and some sort of facial prosthetic or paint.
Kyn aren't half animal/half human, they're anthropomorphisized animals. They walk and talk and are shaped like people... if you watch Grimm, think of the wesen when they're in their not-human form.