Hi there! I have seen your work, and you did a really decent job of doing the homework. I could see good confidence in your drawn ellipses, although the rounded lines sort of fray out and not follow their rounded path, it is something you'll improve on overtime as you use it for your warm ups. As you would become more accustomed to drawing from your shoulder from that point.

As for the spacing between them, I noticed that some of them are overlapping each other (even the top/bottom of the page), while some are too spacious.

(I also did the same mistake when doing the exercise too).

Although some of them are perfectly snug with one another, those two problems are really prominent.

Neither aren't bad, but the goal to make them snug within one another so. This is something that you'll also get over with enough time and practice too. A tip I could probably give you is to underlap them a little, as in lessening their width/height. However this could also present the problem of underlapping, what this does though is it tricks your mind into going against the plan of overlapping it, resulting in it neither being too big or small. (This is what worked for me though, I don't know if it does for you.)

The various sizes of the ellipses are done decently too, but I could some inconsistency with the sizes. Like one ellipse being too wide than the previous ones, or the latter, being too thin. As the goal is to draw them in a set degree or angle, it gives the illusion of them changing angles. Which isn't good, if you want them to be in a same certain degree/rotation. Don't stress too much about this though, this is a pretty minor problem that most of us do, (me especially). Again, practice and time would help, (I would probably sound like a broken record at this point, but it's really what really helps.) Tilting the paper in a certain way could help here too, allowing you to draw in a position you find comfortable.

I wouldn't say you did a perfect job, nor a horrible one either. I could see that you did your best, and understood the concept.

Do not grind, continue on and good luck!