Hello, I'll be taking a look at your work today.

Lines

The superimposed lines exercise looks good, showing a smooth motion and fraying on only one side, although the accuracy is a bit lacking (this aspect tends to improve overtime). The ghosted lines exercise show good planning and confidence, with barely any arching (except for the longer lines). Given that the strokes are tapered, it usually means that the lines are drawn pretty fast. If that's the case, I personally suggest to slow down, so that you're able to get more control over your strokes. The ghosted planes exercise shows a greater level of confidence and accuracy than the ghosted lines exercise, so good job on that.

Ellipses

With the tables of ellipses, you're definitely prioritizing smoothness and confidence over accuracy (which is correct). They're also fit snugly against the borders inside the table, which is good. For the warmups, aim towards tightening up the ellipses a bit more. The ellipses in planes look smooth and confident, although some ellipses tend to not touch the edges of the plane at all, so watch out for that. The funnels exercise is also looking great, you've managed to align them to the minor axis (most of them), fit them snugly against each other and also making them touch the funnel.

Boxes

The plotted perspective looks fine, you've shown a good understanding of how to make two point perspective, although the second frame has a box that's missing its back edge. Also, try to keep the vertical edges perpendicular to the horizon line, some of them are not. The boxes in the rough perspective have the front and back face rectangular, which is correct for one point perspective. You've also applied the lines extensions correctly and used the ghosting method, noticing a big improvement of this in page 2. Be careful of putting the vanishing point of one point perspective way off to the side, as you risk skewing the boxes further from the vanishing point (where two vanishing points is more suitable for these boxes). As the most difficult exercise in this lesson, you've done a pretty good job at the rotated boxes. They don't converge towards the same vanishing points and you've drawn through them; although, some boxes have missing edges (especially the ones furthest back), and the bottom left corner wasn't executed pretty well. Finally, organic perspective shows good use of the ghosting method, however, many boxes have diverging sets of lines, and other boxes have sets of lines that tend to converge in different VPs. Keep in mind that the parallel sets of edges have to converge to the same vanishing point. Some of the Y's arms' angles between them are less than 90 degrees, leading into some particular distortion in some boxes. I'd like you to revise the Y method, to address both the angle issue and the convergence issue. Also, to avoid confusion, I advise to not overlap many boxes on top of each other. For a final touch, you can optionally decide to fill one face on each box with hatching, to show the face that's closest to the viewer. If you do so, remember that every line you trace has to be done with the ghosting method.