Sometimes when I draw shapes in illustrator with the brush, and then join the paths, it doesn’t fill in the way I want it to.
It colors outside the lines, and looks pretty ugly.
The problem is some of the anchors points on my path are not completely lined up. I need to join them.
Fortunately this is pretty easy, just go around your shape grabbing x2 segments at a time, and then join them.
Now when you invert the paint, you should see them fill in nicely.