Hey there, welcome to Drawabox! I'm sluggy, one of the TAs. Let's get into this submission.

Lines

You're displaying quite a lot of confidence with your super-imposed lines. There's very little wobble, except on your curved lines and I'm noticing that there's very little fraying at the start of the lines, which tells me you're taking your time before you put your pen to the paper.

However, the wobble is a bit more prominent in your ghosted lines. My best guess at this would be that the implied pressure of hitting the end point is throwing you off. At the moment, I recommend not worrying about that. Instead, you'll want to make deliberate use of the ghosting technique in order to straighten out the flow of your lines. A lot of the times, a wobble is due to an artist letting their brain get in the way of their stroke, so you'll want to train up your muscle memory and the ghosting technique is a great way to do that.

Once you're confident and consistent with the smoothness of your marks, you can then use the technique to focus on your accuracy. It's fine to take each in turn, before attempting them both at the same time.

Ellipses

These are looking quite good. Though your tables are a bit rough, as you go through the exercises, your marks start to become smoother and more confident. Your control increases as well, particularly with your ellipses in planes, as they're sitting in there quite snugly. Your next step from here would be to tighten them up by continuing to draw through them a few more times.

With your funnels, you'll want to keep a very close eye on that minor axis. At the moment, your ellipses are not consistently aligned with it. You want to think of this minor axis as something like a spine, with each of the ellipses along it aligned with and bisected by it.

Rough Perspective

Strong work on this exercise! While your lines still have that wobble, your perspective work is looking quite solid. You keep your horizontals parallel to the horizon and your verticals perpendicular, which helps eliminate unnecessary guesswork. Likewise, your depth lines are looking fairly accurate, so overall very good work with this. Your sense of 3D is coming along nicely.

One thing I want to caution you against is the tendency to go back over a mistake with an additional line. When you do this without thought, it can actually draw the eye to the mistake rather than cover it up, so unless a line is wildly off the mark, it's generally okay to just leave it be.

Rotated Boxes

Very nice attempt at this challenge. Your markmaking looks pretty decent, the image is pretty clean and readable, and while you don't get that full 180 degree rotation, you keep the gaps between each box a consistent size, which helps take away unnecessary guesswork.

Should you attempt this challenge again, I would recommend the addition of hatchmarks in order to clarify the image. Likewise, you can achieve a fuller rotation by focusing on the VP of each box. If you move it past the VP of the previous neighboring box along the same axis, then it will rotate properly rather than simply move back into space. Overall, though, this is a strong attempt, nice work.

Organic Perspective

I believe this may be your strongest mark-making on your bxoes yet! Your lines here look great, with very little wobble and you only seldomly go back over mistakes. Likewise, your convergences are looking pretty good, which tells me that your sense of 3D is developing quickly. Nice work!