the height numbers below the name mean the height of the person in their human form. so, a 6 foot tall person would have their beast form around the size of that in the drawing. (i still dont have a name for them rip)
they're covered in a weird 'hair' that seems like both feather and fur. its also water repellant and keeps them warm - its just called "fluff".
they can also have varying horns - usually horns that resemble that of a goat's or ram. sometimes they may have reindeer antlers. their tails also vary.
there is a "subspecies" of these that is much larger and have mutiple features. (four ears, four eyes, four wings, way too many legs ... as well as 'bird-like" limbs.) (pictured in the top right corner - the purple figure)