Firstly good job on completing lesson ,

Lines

I had no problem with your lines, they were drawn confidently and fairly accurately, you did a great job

Ellipses

your ellipses where drawn through 2 to 3 times so you clearly understand what I've said to some degree already. Plus your accuracy on the ellispes is really, good job on that!

Boxes

you clearly understand the basic of perspective, very good. You work is amazing so i really dont have anything much to say about it so instead i will give you some tips about drawing boxes in perspective that i know

when you draw boxes in perspective avoid drawing lines parallel lines because those lines gonna convert to each other at some point ( keep in mind: for 1 point perspective the horizontal and vertical lines should be parallel and for 2 point perspective only the vertical line will be parallel )

there is a tips that i always do when drawing boxes in perspective manually is ghosting the line from the start to the vanishing point that way can help you have more sense of where the line should go and of course this method wont makes your lines 100% accurate

not lets go to the conclusion of your work

_what i love about your work is your line confident, you did a really great good job

good luck with your 250 boxes challenge