Make sure you use what's called the "Stabilizer". It's at the top of the window in which you draw pictures. If you don't see it (if there's no bar at the top of the gray area) go to Window -> Quick bar. It will be on the far right of the bar. The higher the number, the longer it will take to show up on the image with your pen, but the smoother the line. ALAWYS keep your stabilizer on atleast 7 or up. Anything lower than that and your lines will be bumpy looking. Stabilizers with "S-" before them will slow down your pen, like I said before. But they are helpful. Using high number stabilizers to do long hair is especially useful!! Good luck!