Update 1

 I've been working on some concept art for our game. While it can't be called profesional I don't think it's that bad.

It's just a sketch for now of a melee brute and a colored mage brute. I think they do a good job at conwaying what we are going for with the theme at least. To make things simple we decided to use simple boardgamelike models for the game, kinda like this.