Awesome man. !LUV the design.
I am a bit of a Dwarf fan and tend to play "the dwarf" when given the opportunity.
You could very well include multiple Crossbow Dwarves in a set.
Pose ideas:
Aiming while standing braced.
Aiming while kneeling.
A Crossbow "sergeant/thane" who has a bit more embellishments on him, perhaps yelling and pointing/waving with one hand while the crossbow is in the other hand.
"Special" Crossbows. Like dual crossbow pistols, larger crossbows for killing big monsters or for firing multiple shots at once.
A crossbow with an effect like there is a rune powering it up or just with the bolt being lit on fire.
So many ideas...