Hi, there.
The normal behavior of Grease Pencil when drawing seems like the direction is inverted by default. I mean, when drawing a line that overlap itself, looks like we are drawing behind the already drawed line. Only noticeble when we draw with Pressure Strengh (of a tablet) ON. I believe this should be inverted, because it would mimetize the real behavior when drawing in real world, and would be more intuitive. And it’s really nice to have the possibility to change directions, so if we want this behavior, we can change.