Sweet idea with a wolf beastman as leader, matching the armoured wolf head with a black orc body.
I like the mystical feel of the shaman, where is that axe / staff from?
The poses of the ungors are also very characterful.
I'm not a huge fan of the elven armour, especially when it comes to the centaur. I also think the size difference between right and left arm is a little to big.
It would be really cool if you were able to make some "non bull" beastigors, but I'm not sure how realistic that is. I recall some possessed warband featured in WD when mordheim was new, with a Beastman built with a wolf head and also a Possessed with a big boar head. I myself will probably build a Chaos Dwarf Bullcentaur based of a boar body (not sure if I'll use an old or new boar). And now when I think of it, the new boars are a little more slim, atleast when it comes to their heads.
Personally I like the last two chaos warhound versions (the plastic kit and the metal ones). Kroot hounds (while maybe a bit to Tzeench flavoured) or direwolves (maybe a bit to macabre) could be viable aswell.
Keep it up!