Hey, Eagle2020. Good job on going through this lesson.

Drawing from the shoulder is hard and seems counterintuitive for beginners, but in the end it pays well. Also, regarding accuracy, remember that at this first stage your priority is to be able to draw smooth confident lines. If you keep practicing correctly accuracy will naturally come later.

Now, moving on to your work.

Lines

Your superimposed lines look acceptable, but there is some wobbling in it. Also, you left a lot of empty space where you could have filled with more lines.

The ghosted lines and planes could also have smoother lines, but they are overall decent. You don't seem to have placed the dots before drawing the inner lines on the planes, though. Be sure to always plot all your lines with dots, as this gives you a goal to draw them to. If you don't place dots how can you know if your lines are accurate? This will help you check your improvement.

Ellipses

Here's the thing. You might think your first ellipses are neater, because then you go through them the second time every line is packed well together, but if you look closely, the ellipses on the first page are not nearly as smooth as the ones in the second page. Actually, in the first page, they are very wobbly. You also didn't draw through on the first of them. Always draw through your ellipses, but don't overdo it. If you keep practicing your ellipses like you did in the second page, eventually you'll be able to draw them rounder and when you go through them the second time the lines won't be so far from each other.

The ellipses on planes are decent, although in some cases you drew through them one too many times. Draw each ellipse two or three times at most.

Good job on the funnels. They could definitely be smoother, but it's not easy to draw them withing the bounds of the arch and aligned with the minor axis. Still these are aspects you should keep in mind.

Boxes

While you understood what was asked on the rough perspective exercise you struggled a lot in keeping your lines straight in here. In the end, the perspective is pretty decent, as demonstrated by your extended lines.

You actually did a very good attempt on the rotated boxes for a beginner, although the top half is quite better than the bottom one. If you kept the back corners of each box more aligned with each other you would have ended with a much better result. I understand that it might feel overwhelming for a beginner to have so many lines drawn over each other, but in the future you'll be able to tolerate it better and easily identify to what form each line belongs to.

On your organic perspective, while you drew a composition from smaller to larger boxes, you should have exaggerated their differences more, in order to better sell the illusion of depth. The larger boxes are OK and seem really close, but you should have drawn the small ones much smaller. The perspective of each box needs some work, but you'll have plenty of opportunities to understand this aspect better during the boxes challenge.

So, the aspect you really need to work one is the smoothness of your lines. While it started decently on the lines and planes exercises, your line quality dropped down going into the boxes. Be sure to plan and ghost your lines very well, so you can draw them with a smooth and swift motion.