As you are probably already aware, mass is extremely important for any horned animal (not nearly as important with antlered game). One thing I use as a reference for goat, antelope and other game judging is a dollar bill. It is exactly 6" in length. I never get caught up with ear or eye comparisons because they can vary so much from animal to animal. As an example a lone 2 year old billy that is off by himself or with a bunch of nannies may appear to be big. He may have larger ears, nose, body than nannies and his horns may appear very massive but in all reality his horns and body have some growing to do. If the same juvenile billy was standing next to an older billy with gigantic body and body parts the juvenile would be dwarfed.
