Congrats on completing lesson 6! I'll do my best to give you useful feedback so that you can improve.

Starting with your form intersections overall your work is pretty good. It seems you've submitted one page full of boxes which isn't a huge issue as your other 2 pages are done well enough. You understand that the intersections occur between the surfaces of the forms rather than the forms themselves. This diagram probably won't help much but it may further your understanding of the exercise. Additionally you can have a look at this form intersection pack made by optimus as well as this guide on how to use paint 3D to further explore how intersections work. Finally I notice that you've drawn the intersection through the form and while usually we always draw through our forms in this course it may be more beneficial to not draw the section around the form as it could just end up making the form look more flat. If you still want to draw through, I would suggest that you ghost over the visible intersection to reinforce the line weight and to leave the line inside the form as a single line.

Moving on to your object constructions I can see that you demonstrate an extreme amount of patience and care into your precise object constructions. Precision being the core focus of this lesson. Up until this point, going through Lessons 3-5, we're primarily working in a reactive fashion. We'll put down masses, and where the next masses go depends on how large or small we ended up drawing the previous ones. There's no specific right and wrong, just directions in which we're moving which impact just how closely we matched the reference. You can think of it as a manner of constructing that works from inside out. Conversely, what we're doing here works outside in - everything is determined ahead of time, and as we build out the various aspects of our construction, we either do so correctly based on our intentions, or we miss the mark.

Precision is often conflated with accuracy, but they're actually two different things (at least insofar as I use the terms here). Where accuracy speaks to how close you were to executing the mark you intended to, precision actually has nothing to do with putting the mark down on the page. It's about the steps you take beforehand to declare those intentions.

So for example, if we look at the ghosting method, when going through the planning phase of a straight line, we can place a start/end point down. This increases the precision of our drawing, by declaring what we intend to do. From there the mark may miss those points, or it may nail them, it may overshoot, or whatever else - but prior to any of that, we have declared our intent, explaining our thought process, and in so doing, ensuring that we ourselves are acting on that clearly defined intent, rather than just putting marks down and then figuring things out as we go.

In our constructions here, we build up precision primarily through the use of the subdivisions. These allow us to meaningfully study the proportions of our intended object in two dimensions with an orthographic study, then apply those same proportions to the object in three dimensions. Now you've obviously taken the use of subdivision and the orthographic study much further than what was presented in the mouse study for the gun and knife but seem to have just guessed while doing the other constructions. By using o.studies we can identify specific landmarks of things on the object which takes the decision making process away from when we construct the object in 3D and moves it to before we actually constructing the object. This allows us to focus fully on thinking in 3D space. You've done this extremely well for the gun and knife and it will be important for lesson 7 so make sure you also do it for every construction there. For now I'll focus mainly on other aspects that you can focus on.

1. The first being curves. 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, whereas others might need to be broken up into a couple or more. 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

2. The second thing is cast shadows and areas of solid black, you've really only used it incorrectly on the 2nd last object. This is more akin to form shading which is something to be avoided in this course. Cast shadows tend to be drawn as a new shape as it's cast on an object (not always) and this diagram can help illustrate that.

Overall you've done a fantastic job using subdivision and orthographic plans to increase precision and the above points can help increase precision even more. Some things to look out for in lesson 7 would be doing an orthographic study for every vehicle and to simplify the curves in the cars to simple lines. Hope this helps and if you have any questions don't hesitate to ask!