I’m... also really confused, that you’re unsatisfied with this, that is, because this is one of the better submissions I’ve come across. Let’s go through it!

Starting off, your lines are nice and confident. Really, the only issue I notice is the occasional overshooting in your ghosted lines/planes, but that’s something that’ll improve over time. Speaking of the planes, be careful that their non-diagonal center lines go through their center points (that is, the intersection of the diagonal center lines.)

Moving on to your ellipses, these are looking quite confident, too. So much so, in fact, that I’ll recommend aiming for 2 rotations from now on. The only thing you need to be a little more mindful of is the minor axis in the funnel exercises. It’s meant to cut them into two equal, symmetrical halves, and it can’t do that if they’re in any way tilted.

Finally, we arrive at the box section. Really quickly, I’ll mention that the back lines in your plotted perspective exercise need to be perpendicular to the horizon (that VP is at infinity.) If your points suggest that they’re not (perfectly normal, it just means that there’s some slight errors in their convergences), simply estimate. The rough perspective exercise improved a lot through the set, though there’s still the occasional issue. The way to fix it is, of course, to ghost more. There’s also a little trick you can use, which is the knowledge that, because of the rules of perspective, the back faces of your boxes are of a similar shape to the front faces, but smaller. That is to say, if the front face is a square, the back face cannot be a rectangle. If your points suggest that it is, they’re incorrect, so plot some new ones. Good attempt at the rotated boxes exercise, though it is a little stretched. The organic perspective exercise, too, is quite nicely done, though I’d have liked to see a few more boxes, and some more difference in their sizes.

Despite these minor issues, this is, like I said, a solid submission, and you’re more than welcome to move to the box challenge. Good luck!