Finally finished up the Deathknell Watch. It use to be that every time I saw this model I was turned off by the skulls. Now after painting it, and "becoming one with the skulls" I actually really like it.
I used the Golden High Flow Acrylics exclusively on this model (except for the oxide on the pool). They load into the airbrush without any thinning or retarders needed and when thinned with water or medium make easy high quantity washes or glazes.
I wish I was able to tell you all how I mixed stuff but I was being very free form about it. So I would suggest just playing with it if you were to try the same. The brown scheme is really fun and looks rad on the table.