Excellent artwork all around. Seeing your interest for both history and Warhammer (Dwarfs!), there is something that may be interesting for you:
The Ninth Age is the spiritual successor setting to Warhammer, with an even more historically grounded fantasy setting. One unique niche part of the setting are Ethiopian Dwarves (rock-cut churches, mountainous homeland, traditions maintained in isolation, long-standing monarchy: quite Dwarven credentials found in Ethiopia's history) of fabled Kegiz Gavem. Brainstorming: www.the-ninth-age.com/index.ph…
Should you ever wish to try your pen and brushwork at one or more Ethiopian-inspired Dwarves, then know that anything (from the quickest sketch to an actual painting) in the vein of donated artwork is always welcome. Mentioning just in case the pioneering subject would be of any interest. Artwork are always key to a good army book, even if done sparsely.
It sounds like a cool universe you have there. But it's a tough one for me as it sounds roughly like this is work I would normally charge for. To be fair to past and future clients I would unfortunately have to decline.