I used the Brian Flyland Studios rope brush and retinted it. The technique is to make a 'ribbon brush' with a seamless loop. If you want to look at a brush set up to do this, https://www.deviantart.com/calthyech...free-854519474 this is a bark ribbon I made from one of my own photographs. Actually I think the full stump is somewhere in this thread, but it is also here so people can draw their own bark shapes.