Hello,

first off, I am not in a good position to critique, since my art is not quite good, but here is my try to at least help others while I am still learning.

Superimposed lines look quite clear, yet the ends require a bit more focus on the ending point as they are quite hairy at the ends.

Ghosted lines, nothing to add to those, they look quite accurate. Just for the sake of paper, more lines can definitelly fit on a paper sheet!

Tables of Ellipses, they look quite nice,I really do like the circles, other than that, a lot of ellipses have "tails" which is either from going from ghosting to drawing or by ending the ellipse in a motion. This really breaks the look of them. Some of the ellipses are also still require a bit more focus so the lines are alligned better on the second+ runs.

Ghosted Planes and Ellipses in Planes, Planes on themself look nice, the ending points still require a bit more focus to end directly in the point, some of the lines end too soon or are a bit overdrawn. The ellipses within them are nicely fit, but the second turns of drawing them are quite messy. Try to focus more on keeping on the same lines on the second round of each ellipse.

Funnels look really nice, but same issue as before, ellipses have tails and the outlines of the ellipses are messy.

Plotted perspective looks good, I have nothing to say here.

Rough perspective, try to focus more on the outline of each box, because those lines are wiggly and they discredit your nice work. I know it's "not that important for this exercise" but they are really hitting the eyes here.

As for the perspective itself, it is not "that much" off, but still needs a lot of work to direct it to the points. This exercise should be practiced more.

Rotated boxes look really nice, but try to focus on the corners on the boxes, at each end near the corner, the lines seem to get off the line, either by lifting the pen too early or by directing it a bit off. Such broken corners make the whole box look a bit off, mostly confusing the view and making qite decent lines look bent.

Organic perspective, focus more on the corners of the boxes, the lines overdrawn over the point break the nice image. Also, the doubled lines on some of the boxes. It might be better to leave a broken box than to highlight the error with second line, for the sake of completion, I understand the reason, but makes the whole box look really strange.

Other than those details, the images looks really nice, all the pieces look nice, I enjoyed all of them, they look clear and focused, basic understanding of everything is there, looks like you know how to draw this stuff quite well, so all of the things mentioned above are just pinpointing minor issues, which might just help to make it look a bit better, but are not really breaking the overall look of the images.

Nice job!