Not bad, but give him unkempt hair so everyone knows he's a worker.
Change the shape of his face, so he appears unappealing compared to other troll units.
Also, given that he goes through the gold mine, do give him the Headhunter's pair of pants and dirty feet.
Give him a proper pickaxe, like the one in this
Peasant portrait.
For the attack gold animation, [have someone help you] animate him so he spins with the bag of gold ore and swings it into people's faces.
For the attack lumber animation, [have someone help you] animate him so he throws blocks of wood at enemy units.