This is one of our most watched tutorials from over the years! We are using acrylic paints and our extra fine tip (1M) black Posca paint pen. To pull off the design you must use a water-based paint pen. You could also get the shading effect using black acrylic paint and water. Grab supplies that you need in our Amazon shop - https://amzn.to/3Xm2pZi | Rock Painting 101