Hello, Prehensile! Congrats for finishing a tough challenge.

Having looked at your boxes, I think you pretty much nailed the challenge. Your convergences are mostly correct (converge away from the viewer. Your inner corners are also mostly within perspective. You've also drawn boxes in a good variety of orientations. Your linework is alright as well, although like you mentioned there are a few wobbly ones. A few tricks would be to try "locking" your elbow and keeping your eye on the end dot (rather than your moving pen). And, of course, remember to go for confident lines above all else.

You mentioned that you had consistent issues where the two lines on either side of box would intersect. I looked through your boxes and I actually don't think it is a common problem with your boxes. For those tricky intersections, though, here are two tips that might help:

• If the intersection happens with the outer lines in a pair (those that define the edges of the box), it's a good sign that you may need to plan your foreshortening more carefully. When you plot your first plane (after drawing the "Y"), take note of how much foreshortening you wait. Generally speaking, the more the line "leans" towards the "Y", the more dramatic the foreshortening will be. If you do choose to have dramatic foreshortening, make sure the other line on the other side is proportional to the shortening you want to achieve, otherwise you'll end up with a box that's half dramatic and half shallow.

• If the intersection happens with an outer line and an inner line (e.g. red lines for Box 186), you may need to check your inner edge to see if the point you plotted aligns with the rest the convergences for your box. Of course, this also depends on how well you plotted the outer edge. It's tricky to get but I find that when plotting the outer edge, it is much easier to make a proportional box when I angle my paper so that whichever "Y" line I'm working off of at is completely vertical and then plan my outer converges around that.