Hi! Welcome to drawabox! Let me first start by saying… you are indeed overthinking it a little, haha. Posture is important, certainly, but it’s the sort of thing that you should flexibly adjust to, should you notice problems arising, than obsess over at the start. Just the same, let me address your questions. Ghosting shouldn’t be stiff, but it should be intentional. There should be no difference in motion between a line that is ghosted, and a line that is drawn, save for the height of the pen from the page. In regards to problem #2, I find that adjusting my chair helps give me enough room to be able to use my shoulder. An angled desk, improvised or otherwise, helps too, though it’s not a requirement. Ultimately, we do the best we can to be comfortable, and to be able to move comfortably, but there’s no need to go out of our way, here. Anything truly wrong that you do, is likely to cause discomfort, so you’ll know about it eventually, and have an opportunity to adjust for it. Anything else, is the difference between 90% and 100%, and that’s not something we’re concerned with right now. I hope that clarifies things. So, let’s look through this~

Starting off, your superimposed lines look good. They’re smooth, properly lined up at the start, and of a mostly consistent trajectory. The only thing I notice, and this is fairly minor, is that there’s a visible ‘stop’ mark at the end of them. See if you can lift your pen off the page there, instead. Your ghosted lines/planes look good, and I’m pleased to see that the only issue I notice, the overshooting issue, is fixed by the end of this submission.

Your ellipses look solid, if a little inconsistent. They’re mostly smooth/rounded, though they’re occasionally stiff/pointy, so be a little more confident in your motions, and mindful of your pivot, if you can. Be a tiny bit more careful in regards to how many times you rotate around them, too. 2-3 times is the recommendation- ideally 2. Be careful, also, that they touch all sides of a frame, rather than floating inside of it. Page 2, row 2, column 2 is a good example of this mistake. The ellipses in planes exercise looks great. Your ellipses maintain their smoothness/roundness, despite the extra complication of having to touch all 4 sides of the plane. The funnels exercise is nicely done, too. Your ellipses are snug, and properly cut in half by the minor axis. One recommendation I have is to lift your pen off the page at the end of them, rather than flicking it off- it’ll get rid of those tails of theirs.

The plotted perspective exercise looks nice, though I wish you’d made some better use of your page. The rough perspective exercise looks good (save for that one instance where you tried to over-complicate it; please don’t do that), and improves nicely throughout the set. There’s some automatic reinforcing issues here, that I’ll call your attention to, though. Remember that each line is drawn once, and only once, regardless of how it turns out. As for the convergences, to take them even further, spend a little longer planning them, if you can. Feel free to consider and reconsider a point as many times as you’d like, before committing to it. In fact, you’re encouraged to. The rotated boxes exercise look fantastic! It’s big (huge positive!), the boxes are snug, and rotate nicely. I appreciate the addition of lineweight/hatching, too. The organic perspective exercise looks quite good, too, save for a misunderstanding: a box that’s overlapping another should not hide its line. There’s a lot we can learn from showing them, and, in fact, we take this a step further in the box challenge, drawing the back lines of each individual box, too. Outside of that, however, things look good: your boxes are of a consistent, shallow foreshortening, and increase in size as they come closer toward us. As a result, they flow quite well.

Solid work on this lesson. Feel free to move on to the box challenge, and good luck!