When I lived in the forest, I painted trees all the time. Now I live in the desert so I should be painting cactus all the time, but I don't. I am working on that. For this I used a technique that used to be one of my favorites, dropping in color wet in wet, waiting for it to dry, then defining the shape by coloring around the edges. Ideally the needles should be golden, but it wasn't working. So I used a dark gray to make them stand out.