I’ve been using an airbrush for a while now. My Sylvaneth tree lord is the latest attempt and finally it all gelled. I switched brushes from the Badher Rage to the Chrome, and much prefer it. Siphon cups don’t seem to hold a huge advantage and there are risks (like it falling off…).
Anyway. The base browns are charred earth and leather from Vallejo, and sword is GW’s Mepheston red with Troll Slayer orange and Flash Gitz yellow for the transition.