I don’t know if someone will read this, but here I go!
The reason I joined, is that I love Grease Pencil in Blender. There is one addon that should be added. When drawing, an artists needs to flip his or her images 180 degrees to see the other side and look for mistakes. This addon should also drawing on both sides. Also, rotating the drawing is also useful when drawing elements that need this feature.
Thank you!