Hey there Cafewombat! Welcome to Drawabox and thanks so much for your patience while we get through submissions. I'm sluggy and I'll be going over your work today, so lets get to it!

Lines

This is a pretty decent start, but I am seeing a little bit of wobble in your superimposed and ghosted lines. most of the time, a wobble is caused by your brain getting in the way of your muscle memory. You can overcome this with deliberate use of the ghosting technique. Running the pen over the page before placing the tip down allows you to build up muscle memory but once your pen is down, you need to make sure you commit to the mark. This will allow you to build up confidence and eventually, a consistently smooth mark.

Likewise, use of the ghosting technique will allow you to hone your accuracy. It's fine to take these two elements of mark-making in turn, however. Flow first, then accuracy. Your lines do improve over the course of the set, so I will say you're quickly moving in the right direction!

Ellipses

Your ellipses are decent, but show the same wobbles as your lines. Your tables of ellipses are a little crowded and I see a good deal of wobble in your ellipses in planes. This is fine and the good news is that the ghosting technique will allow you to overcome these challenges in the same way as with your lines. You're looking to tighten up your ellipses by drawing through them (2-5 times at most) till you're creating a confident, even shape and use the ghosting method to ensure that they're sitting snugly within their alloted spaces.

Nice work with your funnels. You do a pretty decent job of having each ellipses align with the minor axis. While it's not perfect out towards the edges, you seem to have a good grasp of what these shapes should be doing in relation to that initial mark. This will be important for later lessons when you're working with organic forms.

Rough Perspective

Nice work on this part of the challenge. You keep your horizontals parallel with the horizon and your verticals perpendicular with it, which tells me you're aware of how each line should behave. Likewise, your depthlines are looking fairly accurate as well.

The main thing here is your wobbly line-work. Use of the ghosting method will allow you to give each line the time and effort it deserves and allow you to ultimately construct a solid box in perspective.

Rotated Boxes

Very strong work here! Your boxes are readable, the gaps are narrow and consistent which eliminates unnecessary guesswork, and you get pretty close to that 180 degree rotation. If you were to attempt this again, to achieve the full rotation, keep an eye on the VP of each box. If it's moving far enough past the VP of the previous box along the axes, you'll have the box rotate rather than simply move back in space. You do a very decent job of rotation here, however, which tells me that your sense of 3D is coming along nicely.

Organic Perspective

This is a strong start at this particular challenge. While there is some room for improvement in terms of getting sets of parallel lines to converge consistently towards a shared vanishing point, that's nothing the 250 box challenge won't help with. However, your line-work shows a good deal of improvement here which tells me you're quickly moving in the right direction, so very nice work there!