I've created these Corel Painter brushes for sketching. Bookmark this post because I will update it from time to time.
2021.11.16 = Added more brushes, exported from Painter 2022, changed name from Roxys Sketch Brushes to Roxys Drawing Brushes, and changed download location to Gumroad
2020.11.26 = Added more brushes, changed all brushes to use their own brush calibration, and changed name from Roxys Scratch Scribble Hatch to Roxys Sketch Brushes
Preview / Demo: