I like that Dwarvish Stoneborn, his image is quite clear and readable, more i would like his animation for attacks and defense. Chainmail also looks good, but isnt he a little too high? I think you could make shorter his chainmail a bit.
In Dwarvish Brewer most readable are his boots, at his right shoe they should be potions but for me it looks like daggers, maybe animation could make it ore mclear. As for me its not bad, but probably some improvements would be required here.
Edit 2: as for petrified which cant be attacked while being petrified, i suggest to allow attack them but increase petrified unit all resistances by 25% or only physical resistances (blade,impact,pierce) by 50% while being petrified.
Creator of WOTG (+2880 units), MWC (+615 units), SurvivorsArea, RandomColosseum, RC WOTG, RC MWC, ColosseumRandomClonesBattle, BetweenDarknessAndLight, StealingWeapons, MoreUnitsForms, MoreDamageTypes, CanBeOnlyOne, ColosseumOneWinner, BonusSpam, CriticalStrike - available at 1.12 Wesnoth server.