So here’s a more freestyle exercise.
As you can see I use the centerline and sometimes a square in perspective to help orient and proportion the ellipse.
The orientation perpendicular to the centerline and width of the ellipse are very important.
To get the ‘ellipseness’ of the ellipse right just requires lots of practice - let the movement come from the shoulder, hover the pen with smooth motions towards the ellipse you want to draw and when you have the movement put down the ellipse in a single stroke - that is the idea.
Also for all transitions clearly mark and draw a profile where they start and end - as if you were 3D modeling the shape in your mind.
Keep practicing, you are doing good work.
And be sparse with the highlights.
