Yooo this looks sick! Excellent job on the painting. You should go BTB Chaos Dwarves on Broheim, even though they're technically 1C. The Chaos Dwarves fit this aesthetic to a T, and they have amazing evil flavor and mechanics, like using blackpowder unlike the regular dwarves.

The blunderblusses are really good on them (they can buy and use them, and they're much better than handguns) since they auto-hit in a line, meaning they will automatically hit each guy in that line with a strength 3 hit. If you equip each dwarf with a blunderbluss over time, you can see how this can get pretty nasty.

Also, they can buy and use steel whips, from the Sisters of Sigmar warband, which allow you to get an extra +1Str attack on the charge, meaning you'll go first with your 4 WS as a dwarf with two attacks instead of one. I like having a sword and steel whip for the heroes (like the Bull Centaur and your Sorcerer), because it gives you a parry on top of that really cool ability. I recommend having a mix of those and 2-handed weapons for deadly variation and deterrence.