The wood is rendered entirely in Raw Umber and Cobalt Blue mixed on the paper. Placing washes of pure color and letting them flow together naturally allows for soft grays to form, with a few saturated areas to keep it lively. The sawhorse leg behind is Daniel Smith’s Graphite, and a touch of Green Apatite forms the grass.
If you’re curious, here’s the rest of the pallet in context. Wish I’d had time to paint the entire scene!