Lines

Lines are pretty good in general, good confidence, keep it up like that and you'll nail the accuracy.

Ellipses

Ellipses start a bit wobbly, but they end up being pretty confident and smooth, good job! Just as a note, keep in mind the funnel's axis needs to cut the ellipses in identical halves.

Boxes

Pretty good job here as well, you're overshooting some of the lines quite a bit, which hints me you might be rushing a bit on some of them, dont' forget to take your time on each line doing your best if that's the case.

Lastly, don't repeat lines, no matter how off they're, as it makes the drawings messier.

And on organic perspective, you can add lineweight to overlaps to clarify relationships between the boxes, it helps a lot.