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

Starting with your form intersections. I can definitely see that your comfort and understanding of these relationships between your forms have definitely developed nicely. I've done some corrections for your page 3 which had some errors that other pages didn't have but for the most part you seem to understand how this exercise is more focused on capturing the relationships between the surfaces of forms rather than the forms themselves. I'm going to share this diagram  but I think you already understand what's marked out there. It might also help to take a look at this pack which was made by optimus on discord that shows many different intersections. Finally if you want to make intersections yourself to further your understanding you can do so on windows 3D paint.

Moving on to your object constructions. frankly you've done a great job through and through. This lesson is the first point at which we really focus on the concept of precision in our constructions. 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.You are definitely making use of the subdivisions when it comes to the constructions themselves, but there are a lot of areas where your work does not employ concepts shared in the lesson that definitely would have helped you get much more out of the exercises.

Now the way to increase precision in this lesson and lesson 7 would be to use orthographic plans. By making an O.plan which has everything mapped out beforehand to specific locations we can then transfer those locations onto the 3D construction. By doing this we allow ourselves to focus on one thing at a time, when drawing the O.plan we would be focused on specific position of landmarks (like buttons on a remote controller) and when doing the construction we would be focused on thinking in 3D space.

We can see this in your switch joy con but if we take a look at your o.plan it doesn't really tell us the specific positions of the buttons.This is how you would find the specific position of the button which you could then easily transfer to the 3d construction. You also make a decision before you actually construct it of where the button is going to go. Note that I said "make a decision" - this is not about finding the "correct" proportion, but rather deciding which one you will be using. So if you had a drawer face with a handle on it, and that handle extended from the 19/50ths subdivision to the 31/50ths subdivision, that's... a lot to ask of a person. There's not a lot lost in rounding it to 2/5ths and 3/5ths, as long as that rounding doesn't accidentally eliminate some other important elements as a result.

You also want to avoid doing constructions like your beer can / tea pot which have no bounding box as they rely more on your spatial reasoning skills (the skill we are trying to build up) + observation. By having no bounding box you don't really develop your spatial reasoning skills and are instead using them to draw the object.

A couple final notes about areas of solid black and curves, you should reserve solid black only for cast shadows. If we take a look at your funko pop, you've done a cast shadow on its arm which is great, but you've also filled the eyes and shoes with solid black which is more akin to form shading / coloring and should be avoided. For curves make sure you define them as straight lines first before you curve them.

So! When you reach lesson 7 make sure you take it further with your use of subdivisions and orthographic plans as they will become vital for tackling vehicles. Also don't hesitate to ask any questions if anything was unclear.

Good luck!