Good job on completing the lesson! Here's some feedback.

Lines:

Some of your superimposed lines have fraying on both ends. Take your time before every stroke to plan ahead and place the pen down exactly where you want it. You take a confident approach with lines but some of them have a slight arch to them. Don't forget about using your shoulder for every line. Try to lock your wrist and elbow movement before you start drawing, this helps me a lot. I can already see good improvements in your lines, keep it up!

Ellipses:

Good job on keeping the ellipses in their bounds and repeating them only for 1-2 times but don't forget that confidence is more important than accuracy. This applies for lines and ellipses. A confident line will always look better than an accurate one. Try to draw the ellipses in a quick and confident manner. Feel the circular motion with your shoulder when drawing them.

Boxes:

I can see that you used the same rotation for most boxes on the organic perspective exercise. Try to experiment a bit and vary the rotation to make the scene feel more "organic". This is not a very serious problem but it helps with making things more interesting. Besides that I like your boxes and I think you are on the right path.