The idea is that the mask/helmet is quite tall to give them added height and the shoulder armour is large to give them extra bulk. The thinking behind this comes from those old cartoons where bulls always have a massive head and shoulders and tiny little legs.
Weapon wise, I'm thinking along the lines of Greek mythology (axes. clubs, maces). Same with the shield.
With this one I'm taking more direction from the Hawkmoon books. In the stories the boars are big, rough and, well... Boarish! So with this guy I've tried to give him a pretty brutal look with heavy, ugly armour and equipment. Not unlike the vultures really.