I just stared at as many photos from as many angles as I can. I doubt you can get it at a good angle for drawing - moving it back that far would push the center of mass pretty far past the top of the keyboard, and it looks to me like it would topple over.
Looking at videos, 130 degrees is the normal picture they show most of the time. Lesser angles are more vertical.
One thing that isn’t clear to me is if you can flip the entire thing around the back like you can with the current keyboard, or if to use it as a tablet you need to remove it from the keyboard.