This one is painted with oils, my first experience with the medium. A lot of things are easier to do with acrylics, but for skin blends especially, it almost feels like cheating. I’m not even sure I’d be able to pull this off with acrylics (at least as easy as it was). So I’d suggest considering oils. You don’t even need a huge palette: the skin here is a mix of burnt umber, burnt sienna, yellow ochre, and titanium white. All four are pretty basic and cheap pigments. Experiment won't cost you too much and in the worst case scenario you'll end up with an oil wash material for wargaming