Hi! Check if your tablet drivers are updated. You can shoot @ed3800 a message if you're still having trouble after that (he's really good at trouble-shooting). About the smooth lines: I used this brush called "Wet Circle" (has pretty smooth edges and it is part of the default brush set), but also I was drawing in a pretty big canvas, you probably just need to draw in a higher resolution.

Hey, thank you very much! I used Krita to draw this. Really good program, and free, too.

Thank you!