Very nice work! Starting with your form intersections, you're demonstrating a pretty good grasp of how these forms relate to one another in 3D space. You've got a good understanding of the nature of the intersections (like how a sphere intersecting with the side of a cylinder manifests as a sort of S-curve intersection). Through your cylinders in boxes, you're also demonstrating a good estimation of constructing boxes with square faces, and placing ellipses within them in a manner that feels correct to the naked eye.

Moving onto your block-ins, they are for the most part looking very solid. Your constructions as a whole are really patient and careful - frankly, it's a huge step up from your wheel challenge. You're taking the time to break everything down, drawing as many concentric ellipses for wheels as you feel are necessary (probably much easier with the ellipse guide, but as you probably noted yourself, working with a limited master template has its own challenges involved).

You also did an excellent job of managing your mistakes - or rather, managing any urge to correct them. The back wheels of your cab-over-truck had some issues, but the fact that you left them alone made it very easy to ignore them and focus on the parts of the construction that were far more successful.

One area you definitely struggled with a great deal however were your proportions - although this is actually far less of a problem than you might think (as far as this course in particular is concerned), and in some ways it showed just how strongly you've developed your grasp of construction, form, and 3D space. Some of your constructions - like the ford mustang, the biplane, and so on were definitely off in terms of proportion. Looking at the actual proportional studies of the biplane, the preliminary work was off to begin with, and made the body far too short and stubby (same with the wings). That said, the construction itself still felt real and believable, just as though you'd drawn a vehicle that was itself strange (rather than you having made mistakes). I like to call it "shifting the blame". If the viewer thinks you did a fine job, and just drew something that was already weird to begin with, then that's a win in my book.

Looking at the mustang, I think you largely did an excellent job here, and despite the proportions here being a little cartoony, the construction itself was again, entirely solid. I especially liked the front where you captured a lot of nuance and character. My only complaint is that on one hand, I think you managed the curvature of the mustang's cab really nicely, but it also ended up being a little vague in its relationship with the enclosing box. Basically, there wasn't enough information to properly support that curve already present in the construction - you skipped some steps, and took a bit of a leap of faith that your curve would come out well. It certainly did, but within these lessons we always want to make a point of laying out every step of construction, and ensuring that every bit of information we add is properly supported by the existing structure. Of course, you've done a pretty good job at that through the rest of your work.

Admittedly, the Camaro didn't come out quite as well, but I'm not particularly bothered by it. The fundamentals are all there, it just suffered from a series of underlying mistakes (one of which being the initial box being drawn with a back that was slightly larger than its front, breaking with the rules of perspective). All things considered, you still stuck to the structure you'd laid down instead of attempting to correct it - so while it was a sinking ship from early on, you responded to that correctly. Even when things go wrong, we can demonstrate our understanding of the correct process, and you did that well.

When it comes to the shadow shapes you used on your drawings to help clarify your forms, I think the boldness with which you applied them was pretty good, but they weren't always entirely consistent. For example, if you look at this tank, there were plenty of forms present, though you only had a couple of them casting shadows. It's fairly important that once you delve into those bold, confident shadow shapes, that you're willing to apply them across the board. When we leave them half-done, it often leaves the drawing in a state of awkwardness, but once you push all the way through, it can yield a very clear, interesting result. Don't be afraid to have the smaller forms cast shadows as well. I did something similar with this drawing of a haunted house - despite it being obviously looser than your vehicles, the use of cast shadows in even the smaller windows has a pretty nice impact overall.

One other point worth mentioning in regards to that tank is that the turret's cast shadow doesn't actually follow along the forms underneath it correctly. There's an additional form along the front that rises up, but the cast shadow cuts right across it.

That's about it! All in all, you've done a great job, and have really shown an great deal of improvement over the course of all these lessons. I'm happy to mark this lesson as complete, and with it, all of Drawabox. Congratulations on pushing all the way through.

While you've earned your completionist rank, you also have the option of completing the 100 treasure chest challenge, though it is not required.