In regards to your question: yes. As mentioned, every exercise from lesson 1 is to be part of the warmup pool. That said, since all you’ve got is 15m total, it may be best to do a quadrant of it (so ¼), or even as much as you can in the time slot, and then pick up from the same place next time – up to you. As for grinding… yeah, please don’t. Anyway, let’s look through your submission.

Starting with your superimposed lines, these are unfortunately a little wobbly. I’ll remind you that what we’re most concerned with here is not accuracy (so, whether the line sticks close to its guideline), but rather confidence - that is to say, whether the line is smooth. One thing you may try is drawing a little faster, so as to not give your brain a chance to course-correct. The ghosted lines/planes look a lot better in this respect, though they show a little bit of hesitation near the end. It seems like you’re slowing down, as you approach the end point, in an effort to not stop short of, or overshoot the line. In doing so, though, the line is losing its confidence, and in some cases even changing its trajectory to match the end point a little better – this is not what we want, we want to prioritize confidence, even at the cost of accuracy.

The table of ellipses exercise looks great. Though they’ll occasionally start off a little stiff, then stabilize, the majority of your ellipses are confident, and circular. You’ve also drawn though them, but not always the right number of times. A minimum of 2 times (not 1 and a half!), and no more than 3 times, is the recommendation – try to stick to it. The ellipses in planes exercise looks good, also, but I can see some hesitation here. Remember that what’s most important is for the ellipse to be smooth, and rounded. Whether or not it makes contact with all 4 sides of the plane is irrelevant compared to that – only to be thought of if its confidence is guaranteed. That said, this is a difficult exercise, so don’t stress if you’re not able to do this right off the bat. The funnels are a little mixed. For one, your ellipses have reverted back to starting off stiff, the stabilizing. Be sure to ghost until ready, then commit. Any earlier, and any hesitation you feel will be reflected in your linework. Also, remember that their degrees need to increase as they move away from the center, not decrease – so they should get wider, not thinner. That said, they are mostly aligned, so there’s that.

The plotted perspective exercise looks nice.

The rough perspective exercise is not quite there, unfortunately. The most important issue is that your lines don’t seem to make too much of an effort to converge. Either you’re guessing too much, or you’re forcing yourself to stick to your original guesses, instead of altering them as needed. If it wasn’t clear, once you’ve placed a point down, you’re encouraged to check it (by extending it to the horizon line), and if you find it to be unsatisfactory (i.e., it doesn’t intersect it at the vanishing point) you may absolutely alter it. Other than that, the only issue is the linework, which is occasionally lacking, though there’s no reason for it to be, as the process of drawing a line hasn’t actually changed. Also, be mindful of your automatic reinforcing habit – each line is drawn once, and only once; don’t correct a line that comes out wrong.

The rotated boxes exercise is alright. It’s a little flat, as expected – meaning that the boxes resist the order to rotate – and their far planes are both bigger than their near planes (meaning your convergence lines are in fact diverging), and not particularly snug, but this is perfectly normal. It’s the sort of thing that improves over time, as you progress through the box challenge, and learn how a box is constructed. (Which is exactly why grinding is discouraged, here, and everywhere else – compounding interest is the name of the game.)

Finally, the organic perspective exercise looks solid. The lineweight is sometimes a little too much, however. This is not something we want, as a thick line reads as being closer to the viewer, so applying it to the far-off boxes causes some confusion in regards to their positioning, but it’s not too bad. Just, next time, stick to a single superimposed line, applied locally.