Hello Kensa here's my critique:

1)Lines

your lines look fine to me in general, some do need more ghosting tho (for example in your superimposed lines in the first page there's a curved line in the bottom right that needs more ghosting and in the second page there's a straight line on the middle left that also could have used some more ghosting imho). But in general you did a good job!

2)Ellipses

your ellipses in planes also need more ghosting because some of them go beyond the planes, although they have a nice flow so good job on that!

tables of ellipses looks fine to me

some lines of the funnels exercise are off center.

3) Boxes

Generally this entire part seems well done to me.

The part that has some flaws is the rough perspective one, but in my opinion it is quite difficult to do, anyway a part for one or two boxes almost every extension line got quite close to the vanishing point.

excuse me if I can't provide a more adequate critique but in general i'd say you've done well.