Heyo, hope you're having a wonderful day! For the lessons it's highly recomended to do it in ink, for example you can use a ballpoint pen for the lessons, but pencil is also accepted just remember to keep the tip sharp so that the lines don't become bigger than what they need to be. Also there's multiple resources on the discord server if you need to shop for fineliners. You can use Amazon, Blick, Jetpens, jerrys artarama, and more! Anyways for the critique.

Imposed lines are looking great and feel very confident as well! It's a bit hard to see the ghosted lines, but they all look very confident and accurate, they tend to bend just a little bit but as long as you're drawing in a comfortable position and keep your shoulder relaxed and trust in your muscle memory you'll be good to go.

Remember to take a pic of the ghosted planes before you add the ellipsis in the plane so that the viewers can see how they looked, other than that they look great however they are a bit hard to see with the blue lines inside of them. Try to use darker colors and to preview the photos before submitting so that it won't be too much of a strain on the viewers.

The table of ellipsis look fantastic, and so do the funnels! Nice.

The plotted perspective looks great, just try not to draw too many boxes so that it doesn't look too crowded on the paper. The rough perspective looks great as well. That's as far as I can crit, but the rotated boxes looks a bit weird, the rotating boxes are supposed to be one big circle of boxes, sounds a bit weird to describe, but it does look a bit. weird seeing it sectioned off in different areas, were those for practice?

Anyways have nice day and hope you find this helpful!