To be completely honest with you, I've been sitting staring at your homework submission with my mouth hanging slightly open for a while. I'm genuinely unsure of how to give you feedback, for the simple reason that you've absolutely knocked it out of the park - your work here is stellar. I certainly plan on padding out the length of this critique by discussing what you've done so well, but I imagine even I can only take that so far. Well, let's get started and hope that there are at least a couple little issues I can find in order to earn my keep.

Starting with your form intersections, you are by and large doing a fantastic job here. The only thing I wanted to call out is really minor, but it has to do with intersections with a sphere - specifically those that are off-center - so for example, the cone-sphere intersection towards the top right.

When we have such an intersection being centered, where the cone itself is pointing right into the heart of the sphere, we get a perfectly circular intersection line, as you've drawn it there. As we drift off center however, the surfaces stop aligning quite as well, and so we end up with more of a chain of independent curves, going from following the sphere more dominantly, then the cone, and then back to the sphere as shown here.

Continuing onto your cylinders in boxes, just be sure to remember that the line extensions are very much a part of the exercise - they help us test how far off we are from maintaining square proportions for the faces in which the ellipses are set, and help us identify how we might adjust our approach to continue improving on that front.

Moving onto your vehicle constructions, I did actually find one thing to nitpick on, thank goodness - but before I get to that, I want to stress just how much patience and care you've exhibited through every step of this process, and the solidity and believability of each individual constructed form really shines through to create a very obviously 3D structure there on the page. You've made excellent use of the various subdivision techniques, of the technique for creating a 3D unit grid, and in general really pushed the boundaries of this lesson and your overall growth.

So! How can we do better? Well, there are two main things that caught my eye, and I marked them out here over one of your proportional/orthographic plans.

• The first point is in regards to handling curving structures. As explained here in Lesson 6, it helps a great deal to treat all your curves as though they're simplified down into a chain of flat lines or surfaces, effectively leaving the curving aspect out of it entirely. Some shallower curves can be represented with one line/flat plane (like the windshield), whereas others might need to be broken up into a couple or more (like the rear window). This way we can build our construction more solidly first, then round them out later. All things considered though, your grasp of 3D space is strong enough that your curves didn't fall into the trap of being too vague or unclear and effectively undermining that solidity. All the same, it's still something to be aware of.

• You'll also notice that as a result of breaking the curves down into straighter chains, we end up with some clearer landmarks which we can then position at specific points along the length of a given dimension - so for example, we know that the very top of the windshield, where it meets the roof of the car, is positioned right at the 1/2 way mark along the length of the car. You did identify these landmarks for most such major points, which is great because it means that they can then be transferred to your 3D structure - but I would strongly recommend actually placing those landmarks by using the diagonal subdivision technique. Reason being, if the process we use in our 2D orthographic plans is the same we use when transferring it to 3D, there's less chance for information to be lost in translation. It becomes a matter of simply repeating the same process.

And that is all the fault I can find. I really can't say this enough - you've done a fantastic job, and should be extremely proud of what you've achieved. I'll go ahead and mark this lesson - and the entire course with it - as complete. Congratulations!