Lines are pretty confident in general, though you aren't drawing starting and ending dots before drawing every line, on the ghosted planes for example, there are some lines where you didn't place it. Be careful with that, as it's pretty important to apply the ghosting method.

Ellipses in general look pretty neat and confident, good job! On the funnel exercise the minor axis is supposed to cut the funnels in 2 even halves, don't forget to aim for it!

Boxes look p good overall, but you're repeating some lines, no matter how off a line is, don't repeat it, keep going as if it was correct.

Don't forget to draw through your boxes on organic perspective. You should be able to see the boxes, even if they're covered by other boxes. You can add lineweight to clarify their relationship on the line overlaps after.

I recommend trying more overlaps on organic perspective as well. You can clarify after the overlaps by adding a confident, drawn with the shoulder superimposed line on the part of the silhouette of the boxes that overlap.