Hi, I've just finished lesson 1 myself. I'm not experienced with critiques yet so feel free to just use this as a second opinion rather than a sound and complete critique.

Lines:

Your lines look good, and there's little arcing which suggests you're using your shoulder, as you should. Even though the lines aren't perfectly straight, that will improve with time; importantly, the exercises have all been completed to their instructions. One thing I might suggest is trying different angles with your ghosted planes exercise. All your lines are quite close to being fully horizontal or vertical. It can be useful to try different angles to get into the habit of rotating your page for the most comfortable angle of approach.

Ellipses:

Again, these look good to me! They've been completed according to the instructions. The important thing was going over each ellipse twice and keeping a consistent and confident stroke, which you've done. However similarly to ghosted planes, it may have been useful to try some angles, or smaller planes, in the ellipses in planes exercises, just to practice different types of planes.

Boxes:

The exercises have been followed correctly, but I did notice some considerable wobbling here. If you're sure you're ghosting, taking the time to lift your pen off the page before ghosting again and using your shoulder, it could be useful to consider how fast/slow your strokes are. I've found that whilst going fast reduces your accuracy and makes you more likely to arc your lines, it does help give a smoother, straighter line. Going slow on the other hand improves your accuracy, but makes you more likely to wobble. What's important is that you have a think about it, and find the speed that works for you.

I will add, my notes about the planes exercise aren't asking you to do those again, since they were done correctly. It's just something to perhaps keep in mind for future exercises that are similar. Other than that, great work on this lesson!