@trapper13 not sure how @Liamluu did that piece but I’ve watched a few videos on this “style” (mainly because at some point I want to attempt). I’ve seen a mix where people may take a smooth stone (like a hot stone or smooth pebble) and find a “point” they want to use. Others videos I’ve seen the ceramic artist will use the ball point stylus tools sometimes used in sculpting. I’ll let Liam chime in on his technique, but there are various ways to accomplish the impresses.
Edit: I won’t even begin to guess on the colors or layers he used, ha