Welcome to drawabox! Let’s see here.

Your superimposed lines are looking good. They’re smooth, properly lined up at the start, and of a consistent trajectory. Ideally, you’ll want your arcing lines to be a little bigger, but that’s alright. Your ghosted lines are mostly well done. One issue with them is that it appears that you’ll slow down as you approach your end point, likely in an effort to not overshoot – something that cause your line to wobble in that area. Try not to; it’s more important for it to be smooth, and straight.

The table of ellipses exercise is fairly well done. Your ellipses are smooth, and rounded. Try to rotate around them 2 full times, though, and make sure that you lift your pen off the page at the end of them, rather than flicking it off. The ellipses in planes start off a little rough, but look really nice by page 2 – continue prioritizing their roundness, more so than their accuracy. Finally, the funnels are well done; your ellipses there are snug, and properly cut in half.

The plotted perspective exercise looks good.

The rough perspective exercise looks mostly good. Your convergences are solid, and I’m pleased to see how much planning has gone into each one, from the unused points on your page. Linework, on the other hand, though confident, is not very clean. There’s a number of instances where you’ve redrawn an incorrect line – something that, from the ghosted lines page, you’ll remember is discouraged.

The rotated boxes exercise looks great. It’s decently big (but drawing even bigger would be even better, in giving your brain some proper room to think), its boxes are snug, and properly rotating. You’ve done a good job with their back sides, too, and the depth lines are at an above-expected level.

In the organic perspective exercise, plotting start/end points for all of your lines (something you start doing reliably enough in page 2), is indeed the correct way to go about that. Outside of that, and an earlier critique regarding correcting an incorrect line, this exercise looks solid. The size and foreshortening of your boxes do a good job of conveying the illusion we’re after.